Could Giant Mammals Survive the Jurassic?

Could giant mammals survive in the Jurassic Period? The macropredatory whale Livyatan and the other mammalian all-stars of the Cenozoic are dropped into the Jurassic Period, and we analyze how they'd survive. This speculative ecology video analyzes ten giant mammals and their diets, sizes, competitors, and threats if they were placed in the Jurassic Period. Smilodon, Megatherium, Livyatan, and others are ranked on a scale of 1 to 10 based on how they would adapt to their new ecosystem and reptilian rivals. Will these mammals thrive...or be eaten alive?
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/ @thevividen

[@TheVividen]

What would you like to see for the Cretaceous episode? Let me know your thoughts here!

[@Jordaniantrex]

Yes

[@Kyoryu_Unshaken]

hell yeah

[@landenriley8442]

Could Permian creatures survive the Cretaceous

[@Nasty-Allo]

add deinosuchus

[@Alex-dr2lp]

@@Nasty-Allo that existed during the cretaceous

[@SlothOfTheSea]

Jurassic ocean fauna: “I fear no mammal, but that thing….” (Shows L. melvillei) “It scares me.”

[@TheVividen]

Writing this episode hurt my pliosaur fanboy heart

[@danielvanommeren3968]

@@TheVividensame, my heart wants to die, just as my brain

[@dozergames2395]

​@@TheVividenits alright pliosaurs are still the king on our hearts 😢😢

[@DJuuJ]

The rulers of the oceans were a fish and a mammal, truly beautiful

[@loowick4074]

Killer whale solos all

[@singingcrow439]

I wouldn't say mammoths are completely decimated by saurophaganax, though having to fight off predators in its weight class would still be new to them.

[@ccptube3468]

They r huge, heavy with giant tusks!

[@animationlover219]

I think it probably would be driven to extinction, at least if insisted on sticking to the same habitat as Saurophaganax; Saurophagonax seems to have been a specialist in prey the mammoth’s size or larger, something mammoths never had to deal with. At least ancient humans hunted other things; Saurophaganax would probably take them out even more rapidly.

[@GODEYE270115]

Saurophaganax predates on titans, a mammoth wouldn’t be easy per say, but it definitely would target an adult culumbian mammoth before risking a stegosaurus or sauropod target Heck a large allosaurus would probably try its luck too

[@loowick4074]

Elephants tend to go extinct fast in habitats where they aren't very big compared to Predators due too slow gestation period. Smaller elephant species don't survive long in a competitive environment

[@phinhager6509]

@@animationlover219 Saurophaganax did not hunt social animals with giant tusks.

[@ezradanger]

Don't give up on the speculative ecology videos. They are my favorite

[@michaeldorsey9231]

It might be nice to have a vid tackling which of the smaller theropods could thrive in the modern day

[@HagdoBr]

Raptors?

[@uninterruptedrhythm4104]

They’re called birds

[@HagdoBr]

@@uninterruptedrhythm4104 yes, but the other dinosaurs bro. I think all maniraptora be able to survive whit big mammals, but dromaeosaurs are a better choice.

[@hertzwave8001]

the feds

[@HagdoBr]

I see many non-avian dinos manage to survive in Cenozoic. Today its be very easy, the "modern" Earth dont have a big biodiversity of megafauna, dinos will claim the Earth. In Ice Age, the fight was more hard.

[@Cassave78]

Livyatan shall rule the Jurassic oceans with an iron fin! Another h/10 part of Thrive or Eaten Alive

[@kingkeychim4242]

lol iron fin.

[@laseriedeladilophosaure9246]

Les plus grands pliosaurus aurait atteint 13.5 m environ pour une masse de 35 - 40 t et donc aurait été des concurrents de taille

[@SETTHENIGHTONFIYAHH]

Iron flippers?

[@Kudyandare]

​Largest current pliosaur weight 15 ton pliosaurus harve sp barely weight 25 ton and it might be later downsized​@@laseriedeladilophosaure9246

[@xanshen9011]

Paleoloxodon namadicus for the cretaceous episode please?

[@TiruMalae]

Yes yes yes yes

[@lewycraft]

To be fair, outside of climate prooving maybe a bit too hot, Paleoloxodon wouldn't face any serious threat. They would be too large even for the biggest Asian predators like Tarbosaurus, especially in herds, and like any other proboscidea.

[@bantuboi3131]

​@lewycraft if they're as aggressive as African Bush elephants, nothing is going to want to mess with them.

[@loowick4074]

They are also very slow and not as smart as modern elephants. They would be analogs to sauropods with much worse reproductive cycles.

[@GRIGGINS1]

​@@loowick4074that is made up bullshit. And you know it.

[@The_Story_Of_Us]

A comment about Paraceratherium is that since the landmasses of the cenozoic and jurassic were very different, the distribution can't be hyper-specific. If it were moved to its general area equivalent of the Jurassic, the fossil record shows for example signs of giant Megalosaurids like Torvosaurus as far east as Germany, which was very close to where Paraceratherium would have lived in Europe, and in China where they also lived, there was Yangchuanosaurus, that could grow up to 11 meters. It is very likely I think that Paraceratherium may have shared a habitat with large theropods perhaps around 8-11 meters long, certainly big enough to actively prey on even some adults and certainly sub-adults, and assuming their real life experience would apply, being hunted by predators many many times the size of the ones they were accustomed to would present a novel challenge for them. And since size is their only protection, I'd rate them lower. Similar sort of deal applies for basically all elephant relatives. Tusks would be no novelty to the giant predators of the time, who also had to deal with thagomizers. Even an animal like Paleoloxodon Namadicus (and preface here, the largest estimates for the animal are based basically nothing, fragmentary bones from hundreds of years ago, now disintegrated, so it wouldn't likely have been bigger than Paraceratherium) would have been seriously threatened by megatheropods.

[@HagdoBr]

Bro, hadrosaurs were able to defend themselves against the BIGGEST AND MOST MASSIVE LAND PREDATOR OF ALL TIME, so I imagine that rhinos and elephants could defend themselves, even with the disadvantage of having few babies at a time. The real threat to giant herbivores would be competition from herbivorous dinosaurs.

[@lonnielarsen1694]

I'll keep it simple hadrosaurs lived in groups of HUNDREDS

[@HagdoBr]

@@lonnielarsen1694 yes, they reproduce fast tham a giant herbivore.

[@mowabb]

Best prehistoric channel on KZbin

[@SlothOfTheSea]

I concur, Vividen always delivers on the most unique content you wouldn’t think of.

[@mhdfrb9971]

Paleo analysis too

[@phinhager6509]

Theropods had airsacs that probably would have made them unstable in water, so mammals may have had an advantage in swamps and rivers.

[@Distix-uz8qr]

Crocodilians with the asist at that 🦾🦾🦾

[@andreafleming9022]

Even the average gdi for megistotherium is 612kg and the larger recent skeleton is 900+kg.

[@MrPink-qf1xi]

The algorithm requires engagement.

[@TheVividen]

And it appreciates your contribution

[@TheLordHighNoob]

Very glad to see this series return! And would love to see paleoloxodon in future!

[@garrylean9493]

Wouldn't mind seeing a mini series starring Mezosic herbivores in the Cenezoic, similar to your series with Theropods coming back in the Cenezoic

[@Ratchetcomand]

Video suggestion: Could Permain period animals surivie in the Cenozoic?

[@widodoakrom3938]

Up

[@PrehistoricMagazine]

Wow that thumb nail looks like moby duck from hell: amazing artwork. Mike

[@CrankyAf]

Mobey duck lol

[@PrehistoricMagazine]

@@CrankyAfmeant moby dick I’m an idiot lol. Mike

[@PrehistoricMagazine]

This is a really cool topic. Any video with Saurophaganax in it is a great topic to me. Mike from Prehistoric Magazine

[@DaKillaCroc859]

I can’t wait for part 3 with the cretaceous. Very curious to see how Livyatian does in the seas at that time.

[@notmyrealchannel559]

Everyone's favorite Predator X will become food for the Livyatan if we were to put Livyatan in the jurassic period.

[@jagk-du3yw]

The only more one-sided fight would be putting orcas in the Jurassic. It's legit impressive.

[@loowick4074]

Honestly the triassic may have been tougher with giant ichthyosaurs than the Jurassic or Cretaceous seas

[@josh-themighty9967]

I was absolutely looking forward to this second Jurassic period episode for ages!! And it did not disappoint 😁 I was interested to see the Stegotetrabelodon doing well with the vegetation and predators better than my poor Columbian mammoth 😭 Smilodon doing well was nice to see! I can't wait for the final Cretaceous episode in the future! I do think if there could be another additional invasive species the giant short faced bear specifically Arctodus or Arctotherium could be cool to see in the Cretaceous. Paraceratherium living alongside Therizinosaurus, Deinocheirus and Tarbosaurus would be awesome!!

[@lightning77125]

Youn should also bring in the sperm whale. It's larger and heavier than all Jurassic predators, but what I'm wondering is if it can adapt to a diet of reptiles rather than fish and squid. If so it would be like 9.7/10

[@lightning77125]

Still the heaviest active predator ever at 60-75 tons

[@ShoaibMalik-un1gu]

I dont think it would be possible, sperm whales have no upper teeth to grip and rip prey and its teeth are way smaller than livyatan. I belive thats why it prefers soft bodied animals to suction in.

[@frost7463]

@@lightning77125megalodon is larger than that.

[@Damasen13]

We're gonna need a Cretaceous episode. Curious to see how the Livyatan fares there.

[@TheVividen]

It's in the works! Might be a few months before it comes out if the four month gap between Triassic and Jurassic episodes is any indicator haha

[@atToebiscuit]

I think a Livyatan would fare pretty well against Mosasaurus, Elasmosaurus, etc.

[@Damasen13]

That food chain of the late Cretaceous ocean is gonna be fun to speculate with a kaiju whale competing with several different species long marine lizards

[@Damasen13]

@@atToebiscuit it'll definitely be fun to speculate yeah

[@luukzilla1519]

A random off topic question, how long would something like Basilosaurus survive in modern day oceans?

[@villager736]

Humans would quickly kill them off

[@adejoharuna1005]

Would probably get mugged by orcas

[@countchompula1896]

@@adejoharuna1005 Dude, everything gets mugged by orcas. They’re op pls nerf.

[@David-ni5hj]

Could you do a video about how much would dinosaurs weigh if they were as massive as mammals??? That'd be almost the opposite topic to this one

[@RheaMainz]

erm, dinosaurs with the same mass as mammals would weigh the same. Do you mean as small as mammals in the context of volume?

[@David-ni5hj]

@@RheaMainz yeah, I mean it regarding volume/surface area. As it's supposed that Dinos weigh less because of their hollow bones, air sacs, etc.

[@doragonzx]

I'm just gonna say it, most will be able to survive but not exactly thrive

[@rng8899]

Megatherium is, indeed, closely related to modern sloths (who are believed to be descended from prehistoric ground sloths), which also share their (proportionally) enormous claws. Needless to say, modern sloths don't particularly use those claws to fight. And sloths aren't exactly known for their agility, either. While megatherium didn't necessarily share a similarly minimalistic metabolism as modern sloths, it was still a xenarthran, not famed for their particularly active metabolisms. All in all, any characterisation of megatherium as something approaching 'Fierce' is likely a flight of fancy inspired by the very same claws its modern relatives also possess, despite modern sloths not showing any of these supposedly 'Fierce' characteristics. Common in documentaries because prehistoric animals of course have to be fierce, but the reality of this characterisation is, err... Questionable is putting it mildly.

[@kingofprehistory7851]

Noice. Do the cretaceous next fr

[@subnombre]

Livyatan Melvillei: The power hierarchy of the Jurassic period is about to change One question: how heavy would Paraceratherium be if it had the shape of a Rhinoceros and not a Giraffe (that is, if a current Rhinoceros had the dimensionality of Paraceratherium)?

[@TheVividen]

One thing is for sure: absolutely yoked

[@juritudi57yearsago59]

One thing to consider, because of the heat I reckon these mammals would just go back to more nocturnal behaviors like their ancestors did. It would be crazy to see ambushes done by megistotheriums on anything at night when most Dino’s would probably be asleep.

[@aottadelsei980]

I know you did T-Rex vs Giga can also do a video on the other most debated fights Livyatan vs Megalodon

[@kilianteni7884]

At same weights Livyatan at maximum size Megalodon.

[@kilianteni7884]

Even tho we dont know the maximum for Livyatan because only 1 specimen.

[@widodoakrom3938]

Livyathan did fight against megalodon but not with giga vs T-Rex

[@loowick4074]

The thing with elephants in particular i think people over estimate them alot. Elephants tend to go extinct relatively quickly when there is a Predator that can reliably hunt them in most biota due too slow population replacement compared to say a pig that is half their size. Their size is their biggest advantage and having that taken away makes them very vulnerable. Id argue that smaller mammals can survive better as they are competiting in niches they can outpace dinosaurs in.

[@TheVividen]

I'd tend to agree

[@Distix-uz8qr]

Agreed

[@loowick4074]

Adding to my comment it seems like alot of paleo circles are propping up elephants along with orcas and humans as thriving in mesozoic animals. Orcas probably have the best chance of the three. With humans, anything below erectus on intelligence is not gonna expand at all and as for humans themselves it depends on part of the mesozoic, like our expansion may be slowed or accelerated. While elephants would actually suffer more than other animals like pigs and small fast antelope as there are predators that can reliably hunt them down while being hilariously outpaced in reproduction by the native herbivores. It seems like the idea kinda sprouted from a gojicenter video. Where people have concluded that survival of a species depended on winning 1v1 fights against suicidal predators. Which If that's the case buddy. Cows would've wiped humans out long time ago.

[@luukzilla1519]

Yet another random question, what are your thoughts on Vulpimancers? (creatures from an old show called Ben 10)

[@floweryomi5351]

"biker gang of demonic bacon" is an S tier line

[@frankperez4197]

Could Pareiasaurs Survive the Triassic Period?

[@gigamosaurts2513]

Next cretaceous ?

[@myleswelnetz6700]

Could Cenozoic mammals survive the Cretaceous period?

[@jessehutchings]

All i know is that large therapods or proto tyrannosaurs would be eating good on large mammals like all you can eat burger king

[@snakeboi2.o]

Damn daeodon is huge

[@wongyc5585]

Mammoth have front eyes which they have no fear from Saurophaganax. Well there are still no evidence whether Saurophaganax can be classified as a giant theropod like T rex and Giga. The Allosaurus vs Megatherium fight is interesting,sharp claws and jaws taking on muscular arm with claw

[@AG-tl8oq]

Wouldn't the columbion mammoth just stab it with it's tusks or grab them with it's trunk? Or are the theropods too fast and agile for that to be a possibility?

[@da_phish]

grabbing isn't a possibility but stabbing is

[@trvth1s]

Theropoda have hollow bones and are highly muscularized, like modern birds, thus they're very agile, like modern birds. Predators like allosaurus adapted for tens of millions of years to hunt giants like stegosaurus [as big as todays biggest elephants] which adapted giant serrated spikes covered in keratin across its back, and a massive tail with spikes at the end and massive muscle attachment joints. These animals spent tens of millions of years honing in biomechanically to deal with giant predators/prey with specialized armor and weaponry. But a slow mammal with primitive lungs, primitive bones and 2 buck teeth is a threat? A slow fat mammal whos biggest threat was a cat that's a few hundred pounds? LOL

[@hyrax2330]

​@@trvth1sYou are heavily underestimating proboscideans. "Slow fat mammal" as an elephant enyojer I feel offended. Elephant's body fat is literally lower than in athletic humans, and it was likely pretty similar in columbian mammoths. Elephant's trunk has more muscle than entire human body. They are also smart and know how to use their weight and tusks. A theropod of smaller/close size is going to have a hard time killing an adult M. columbi, not only because it's smaller, but also because mammoth's skin is quite hard to pierce, and it can also kick or just use it's massive tusks like a club. Also, no predator other than human was dangerous for adult M. columbi. I love dinosaurs. I love mammals. I love animals in general, but I hate when someone is downplaying one animal group and praising another. Like dinosaurs were some kind of "super ultimate-life-form dragons" and mammals are just normal boring dumbass things.

[@trvth1s]

@330 I agree with you. I'll add: ornithischian dinosaurs were very similar to mammals: their bones were full of marrow, they chewed their greens. They had a few differences [teeth never stopped growing] but nothing too crazy. Their highest weight limits were also the same as mammals. Ornithischians thrived, so mammals could theoretically. The issue i see is that ornithischians were in an arms race with giant predatory theropoda for tens of millions of years, so even though they were as big and strong as mammalian herbivores, they adapted features to deal with giant predators. The giant predators were possible because there was a lot more big prey. Look at hell creek formation. You had 2 ceratopcian species bigger than any terrestrial mammal today. You had an ankylosaur which was as large as bush elephants, and another ankylosaurid species as large as asian elephants. You also had bush elephant sized edmontosaurus which were in massive herds. The icing on the cake, you had a whale sized titanosaur, which when dead would provide plenty of calories for scavenging predators. My point is in many habitats elephants were not too large to take out. The 2 ceratopcian species in hells creek that were bigger than bush elephants, had to evolve a massive thick serrated frill covered in keratin just survive predatory attacks, these are characteristics mammals like elephants havent had to evolve. Throwing a modern elephant who's the best of this age in an era where it would be less than average would be suicidal. I do agree allosaurus would have an issue with colombian mammoth but i think it would do perfect against modern bush elephants. Allosaurus is not the largest theropod even of its time, there were habitats where colombian mammoth would be out of its depth

[@DoomRulz]

I love these videos. Thank you.

[@praise_kek340]

wont the livyatan also have powerful sonar?

[@alexandersviridov2937]

This is where the fun begins😂

[@SonLing2077]

Gigantopitechus seria massacrado ou ele iria fazer um belo combate com um ceratossauro igual king kong vs v rex?

[@RichardKushman]

Realistically we don't know because all we have of the great ape is a couple of teeth and a partial jaw so everything about it is based purely off of speculation. For all we know it was 8 feet tall and 4 feet head and 4 feet body

[@RichardKushman]

Even more so than a Meg which we (likely) have a partial spinal cord for

[@josh-themighty9967]

I was excited to see Livyatan dominate the oceans of the Jurassic I'm surprised not even the giant Pliosaurs could be much of a problem for it, makes me wonder how Livyatan would fare in the Cretaceous? I was a bit sad about my Columbian mammoth getting annihilated by Saurophagonax although they do have large tusks I think would be helpful alongside their social herding behaviour. Perhaps in this scenario they'd stick with some herbivorous dinosaur species of some sort for mutual protection?

[@widodoakrom3938]

Livyathan will struggle to survived with the heat in cretaceous so livyathan score will be down furthermore in cretaceous there's small mass extinctions that lead the extinction of icthiosaurus so livyathan will be struggle to survived

[@5nhyfiery]

How about the Golden age of dinosaurs the Cretaceous?

[@MrHusang23]

Livyatan takes everything, like a KAMAZ at an intersection.

[@dom9300]

i feel like you really downplay the colombian mammoth here, 1 saurophagonax or torvosaurus would have a hard time taking on even one mammoth. even losing to one most likely. you also have to take in account that mammoths would likely travel in big herds which would grant them alot of protection.

[@spideyfanw1748]

Saurophagonax would most likely try to kill the Mammoth through blood loss by using its huge claws and teeth. As for Torvosaurus, its bite force would be more than enough to break off the Mammoth’s tusks or break any bone in its body along with blood loss from is huge claws. The Mammoth doesn’t have huge armor or thick reptilian scales/skin to protect itself from the damage their claws would cause. Also Elephants today can defend themselves easily from the front but they’re vulnerable from behind and that’s where lions, hyenas and other predators that can hunt young elephants attack them when ambushing them. These two theropods would have no problem ambushing a lone full grown mammoth from behind, doing as much damage as possible before backing off. Then they would just repeat the process until the mammoth died.

[@hyrax2330]

@@spideyfanw1748 The tusks, maybe if it can catch a good grip and mammoth won't move much. That's because tusks are made of dentin and enamel, not just bone. Mammoth might not have armor, but the skin would be pretty good against strong bite forces, because it was thick and loose, like in modern elephants, so it can absorb shock in thicker areas. Also mammoths could kick with one back leg at a time (like modern elephants), which might not be effective against predators of similar size, but against smaller torvosaurus and allosaurus it could do some damage. A pack of torvosaurus, or bigger sized predators would be very dangerous for a lone mammoth, but one predator, even of similar size, wouldn't have it easy by any means.

[@11Legorex]

Predators wouldn’t kill them in every or even most encounters but coupled with slow child birth and substantially lower nutritional diet available all three stressors would be quite a lot for Columbo

[@GODEYE270115]

Theropods that size made a living out of tackling sauropods and large herbivores. A culumbian mammoth wouldn’t deter a Saurophaganax

[@11Legorex]

@@GODEYE270115 they’re formidable predators but the intelligence and group defense is not something Sauro dealt with to the degree of a Mammoth. Sauropods and other dinosaurs were not nearly as intelligent so likely weren’t as capable an opponent

[@OneAngryPagan616]

ᛋᚳᛠᛞᚢ ᚹᛁᛏᚪ ᛋᚪᚷᚩᛚ ᚾᚪᚾ ᛏᚩ ᚳᚪᛋᛖᚱᛚᛁᚳᚹᛁᚾᚾ!!! Love the Spec Evo content! What would ye say to large extinct or extant Mustelid species in the Mesozoic? I haf often wondered how something like a Wolverine/Honey Badger would adapt and evolve in the early Triassic in particular.

[@TheVividen]

Just saw this comment! You're going to love Saturday's video.

[@GODEYE270115]

Moby Dick Melvillei would rule the Mesozoic oceans Land tho, mammals wouldn’t fair as well

[@kusanagi91]

You should do speculative video after putting the animal in the Mesozoic would they evolve .

[@Bruce_shark-08]

Hopefully, Perucetus does better in other time periods

[@myleswelnetz6700]

4:17 9-19 US tons, rounding up.

[@cacogenicist]

I think you may be underestimating the fight in an _M. columbi_ Tangential, but while one can imagine things going south for the _Mammuthus primigenius_ from mere climate change, it's really hard for me to understand why a creature as adaptable as _M. columbi_ crashed as well -- without those ugly long-leg apes having been heavily involved.

[@Terraraptor1]

Do you have a source on Megatherium constructing burrows? I had looked into it in the past, and all I had found was that Mylodont sloths dug burrows, no info on the big guy.

[@RandomMackem0069]

I googled it and said megatherium likely dug burrows due its lack of ability to climb trees

[@HeWhoMurksWithOneLeap]

If they're not getting hunted by Saurophaganax and Allosaurus, they're getting bullied from the watering hole by Stegosaurus and Brachiosaurus.

[@Dark.Knight.Detective]

Actually 500 kg Megistotherium is outdated. According to Dan Folkes they were around 1.1-1.3 tons

[@samuelruakere7728]

I believe megatherium wouldn't have had a problem with the heat as like most extant Xenarthran's it more then likely had a slower metabolic rate making the heat a welcome guest as it would've made it more active I also think we should take into consideration that only 1 ground sloth species was found in very cold areas the rest were found in the hotter states of North America and all the warm parts of North America plus the internal chainmail and hare it would have had even in a hot climate because of it's slow metabolic rate mean that unlike most mammals it could do quite well in the Jurassic it also would've likely moved in herds being more of prey item to more carnivores then modern sloth's.

[@sumboyuknow9764]

Megatherium gets dumpstered by Allosaurus. Also that New Jersey lol

[@RandomMackem0069]

Is because of the lack of fossil evidence we don’t know if Eurasia had allo sized predators aside from the European torvo

[@michaelstone5298]

Why Hyenadons, and not Bear Dogs? Some of the largest species were about as big.

[@superiorcybergodzilla5670]

Could you talk about the Paleogene?

[@michaelstone5298]

Again Thylacoleo would be a better fix than smilodon for the Mesozoic to hot for smilodon.

[@bkjeong4302]

The Triassic and Miocene marine superpredators would outright prey on anything the Late Jurassic or the Cretaceous seas have to offer.

[@tyrannotherium7873]

I wonder if the Columbia mammoth would push a Stegosaurus away I also think that may be a Columbian, mammoth and musk would beat down a saurophaganax

[@trvth1s]

I dont think so, saurophanax likely hunted sauropoda that were far larger and far more powerful than colombian mammoth. If the colombian mammoth is alone it is an easy meal, like the video of the moose on musk that fought a brown bear and became dinner. Colombian mammoth never had to deal with giant predators. Stegosaurus was elephant size and it was specially adapted to deal with giant predators thus why its entire body is a weapon.

[@tyrannotherium7873]

@@trvth1s I don’t recall moose can go into musk

[@trvth1s]

@@tyrannotherium7873 almost all vertebrates get aggressive during mating season aka musk. 150 ton titanosaurs almost certainly did as well 😬

[@tyrannotherium7873]

@@trvth1s with elephants its a differnt story

[@trvth1s]

@@tyrannotherium7873 you're wrong. Carnivores actually have higher hikes in aggression, and testosterone, than elephantsduring mating season. There's been male lions that have gone in killing rampages like the Mapogo lion coalition. What they did had never been done by elephants in musk. Elephants are awe inspiring because they're the biggest vertebrates TODAY. Could you imagine trex in mating season? They were literally crashing skulls. Titanosaurs were on another level. If you put a titanosaur during mating season in the savannahs of Africa today, all elephants and rhinos would likely go extinct within weeks, theid be crushed for existing

[@twomato8902]

Something i think you underestimated here is the Columbian Mammoth's intelligence. If they were as smart as their relatives today they'd surely find ways to defend themselves from large predators. Perhaps having Bull males around the herd instead of them being nomadic and solitary.

[@RichardKushman]

Love that these things keep highlighting the horrible truth that toothed whales/dolphins are the broken abominations that they are

[@KaijuUniverse_sucks]

Would be excited to see Paleoloxodon. Although, it is just your generic "massive mammoth", I'd be interested in how well the supposed biggest mammal would perform, even if it's in the cretacious.

[@TVAVStudios]

Whilst it is bigger than Paraceratherium, the difference is pretty slight when you're putting them in the context of the Jurassic. But yes, Paleoloxodon taking its place in the next video would be cool.

[@lewycraft]

​@@TVAVStudiosi mean, while only slightly bigger, it was way heavier bu even 8 to 10 tons

[@TVAVStudios]

@@lewycraft Hadn't realized the difference was that much!

[@lewycraft]

@@TVAVStudios yeah, it was absolutly massive

[@GRIGGINS1]

Gojia Center did a vs pitting the Paelo vs a T Rex. The Rex got murder stomped.

[@tyrannotherium7873]

I do agree that Leviathan would be a 10 because it would pretty much destroy all of the marine reptiles. And deodon well, it would be on the menu even Ceratosaurus would give it a run for its money

[@trvth1s]

Leviathan was deadly but i always felt the mighty ichthyosaurs are highly underrated in the jurrasic, people only care about the mossosaurs which ruled for a few million years in the late cretaceous. There were TOOTHED ichthyosaurs that ECLIPSE levyiatan in mass and power. They just found an ichthyosaur which was as big as blue whales, and another species that may have eclipsed them, these animals had TEETH not filter feeders

[@monsterzero521]

It's ' LIVYATAN '

[@proton3748]

15:09 Jjk reference

[@thecolorpotatoe1927]

I don't fully understand the ranking system. You sing the praises of one mammal and place it at a 5. But talk about how another gets predated on and outcompeted then give it a 6.

[@Kudyandare]

Hey vividen can u could Asian theropod survive Cenozoic Africa plss

[@gambitaku6179]

Fun vid

[@Intrusion498]

Correct me if im wrong but i think allosaurus average weighed up to 1 ton and max 1.4 tons or 3280 lbs and I think that saurophaganax wouldn't clap colombian mammoth i think this dude if the saurophaganax fell down bro would pummel sauro with his feet plus a group of these wouldn't be the ideal prey for saurophaganax

[@trvth1s]

Saurophanax had hollow bones thus was very agile and with its tail it likely would be near impossible for it to fall. Colombian mammoth was about twice its mass, but the theropoda is far larger and far more powerful than any predator colombian mammoth ever saw. Saurophanax may have hunted animals far larger and far more powerful than the mammoth. If the colombian mammoth has its group and the saurophanax is alone, then i beleive the mammoths would be fine. If both are alone the theropoda would certainly kill the mammoth. While the mammoth is twice as heavy, the theropoda had hollow bones and airsacs thus far better stamina and would seem huge thanks to its light frame. Saurophanax was used to hunting largearmed prey, the theropoda would use agility to get on the back of the mammoth, saurophanax was taller than the mammoth, it would sink its massive claws into the mammoths back and hold on for dear life until the mammoth is exhausted, then the theropoda's massive gaped jaw would slice through the mammoths back and neck flesh like butter. The power in such a confrontation would be awe inspiring.

[@biluroy9366]

And Jurassic / cretaceous Dinosaur survive in 11000+ years ago period if food is enough

[@accelerat3447]

15:08 REALLY? LOBOTOMY KAISEN REACHED JURASSIC PERIOD?

[@Nasty-Allo]

h/10 video

[@Cassave78]

h

[@BIGBRITISHBLOKE]

YO its out! (oh cool i got a first comment)

[@biluroy9366]

Can also giant mamals survive in Cretaceous

[@ahmedshaharyarejaz9886]

This question seems to be trend in the Ytube Paleo community these days.

[@SamSays101]

Somethings wrong with your audio

[@monsterzero521]

Veterupristisaurus is almost invalid I believe .

[@laseriedeladilophosaure9246]

Brachytrachelopan serait beaucoup trop gros pour un smilodon populatoire car il mesure 10 m pour 5 - 6 tonnes probablement se qui n’est même pas un peu comparables a smilodon de plus smilodon cerait même exclu des plus grand prédateurs de cette époque qui le dépasse tous en taille et en puissance. Donc la chance de survie du smilodon est de 3/10 en réalité

[@andrewshear2927]

Interesting video, but I would have to say that no terrestrial mammal could survive or thrive with the Dinosaurs they would all be eaten alive.

[@Leptospirosi]

Given it's size and strength, I don't see any problem for a Smilodon to take on and kill anything of the size ans smaller then a Ceratosaurus. If you've ever seen a cat or a ferret in action you'd see why. After all theropods were relatively light built compared to a much denser mammal; Agility, claws on powerful legs ans huge fangs made to take down hippo sized preys would deal devastating wounds to large but light built preys like the dinosaurs. It could not compete with beasts like adult Allosaurs and larger, but that's not the point. A medium theropod had large jaws, but could not compete with the close in brawl capability of a large cat like the Smilodon. There is a reason why terror birds got extinct in South America and replaced by mammal predators.

[@trvth1s]

That's non-sense. Terror birds had no claws, terror birds were also smaller than the mammalian predatory invaders, unfortunately birds have a major size limit due to their posture. Ceratosaurus was a PREDATOR that weighed a ton, it would easily CRUSH any big cat in history. Theropoda have hollow bones, which means more of its weight in in MUSCLE, not marrow like with mammals. This is why birds are far more powerful and more agile than mammals pound for pound, eagles regularly hunt cats and foxes that are bigger than them. Airsacs also give theropoda supreme stamina. Theropoda claws vary but many had far deadlier claws than big cats. Animals like dromeosaurids claws were like big cats: for grasping prey or trees, an they used all 4 limbs to grasp. Theropoda like allosaurus had MASSIVE claws and their arms were VERY powerful. I'm not sure you understand how they hunted. If they saw an elephant, like with stegosaurus theid know not to go head on. Allosairis hollow bones and highly muscularized body would make it very agile, it would look to outmanuever and jump on the elephants back or rear up and sink its claws on the mammals back, like a bird of prey. Like eagles, when they grab they wont let go. It will leach on to the top of the elephant who in pain will fight back and struggle. Allosaurus stamina was superb, the elephant would tire. This is when allosaurus massive gaped jaw would start slicing through the mammals flesh like butter

[@BugsandBiology]

The terror bird thing is a myth. They went extinct for unrelated reasons before Smilodon spread into South America. In fact, the terror birds spread into North America first, and managed to establish themselves as apex predators even with pre-existing competition from multiple mammalian carnivores.

[@YaseenOmarMotala]

Orcas would dominate , honestly.

[@Titus-as-the-Roman]

The Jurassic with it's Gigantic Hell Chickens (Chickens ARE Dinosaurs), seems impregnable from later mammalian predators, but that's wrong, very large animals was only a small part of the total population. There is Not a Theropod in the fossil record that could catch even the slowest of today's big cats in a dead run. I can seriously visualize because I have studied Jaguars (3rd largest cat) a long time, they would run rampant through an unsuspecting Jungle (*), with large enough population I can visualize local extinctions of both prey and that prey's previous predator. (*) imagine your favorite Sweety of a Furball Mouse destroying Kitty let loose after hours in a pet store with many open top containers, so Many mouse variations it makes Miss Kitty from Kansas City head shake, there's occasional snakes, large lizards w/ of course always a few Counter Butt-smelling Canines to pose potential hazards but a Wiley cat can get around all that non-sense. A Jaguar, after thinking about it more, would have destroyed most of the early Jurassic's jungle inhabitants. There vids of Jag's attacking and defeating Black Caimans larger than themselves IN the Water (the water is where today's Crocodilians Usually has All the Advantage). SORRY ABOUT THIS, HONEST, I got started, couldn't stop

[@worldsbuffestloremaster]

If a tiger can be 660 and a lion can be 550, how is an 880 pound sabertooth more than twice the size of modern cats?

[@thampithampi3169]

All of them will be fucked up do to group hunting

[@raefordmoore9482]

Could the gigantopithecus have survived the Cretaceous era

[@raefordmoore9482]

Vid idea

[@Distix-uz8qr]

No

[@rayhanmustakim7073]

So if Livyathan would dominate the Jurassic ocean, can sperm whales do the same?

[@TheVividen]

I'd say that's very likely!

[@sonpopco-op9682]

None of those massive Jurassic Dinosaurs could survive if brought to life in modern times. Clearly the gravity was much less than today. Probably only about a quarter of a modern "G" judging by fossil evidence.

[@robinsonray6766]

That is an outdated conspiracy theory.

[@GRIGGINS1]

The Columbian Mammoth is literally smarter than every Dinosaur in the Jurassic. It would Maul those Predators via superior tactics. For Goodness sake Modern day elephants even outsmart humans at times.

[@robinsonray6766]

We don't know extinct dinosaurs intelligence. What we do know is intelligence wouldn't save Colombian mammoth. The smartest being in the ocean, bottle nosed dolphins, are literally regularly hunted by 3 different shark species and by orcas. Intelligence would help if elephants were smart enough to make spears and guns. They're not. Elephants avoid predators with sheer size and power of adults. In the jurrasic that goes out the window. Stegosaurus were essentially armored elephants on steroids with deadlier weaponry

[@GRIGGINS1]

@@robinsonray6766 Dude we have records of Elephants holding grudges against individual people for decades. In India one elephant killed a lady. Then days later showed up at her funeral to desecrate her body. That is damn near human level intelligence. Elephants can and do use group tactics when facing threats. They do so against humans. So why do you think they won't do so with a much dumber animal.

[@robinsonray6766]

@@GRIGGINS1 again; elephants rent intelligent enough to use guns or spears. Bottle nosed Dolphins are literally more intelligent than elephants, and they are regularly preyed on by sharks. What is a group of elephants going to do to a group of allosaurus? Allosaurus is faster and is literally built to kill elephants the size of African elephants. Unless elephants learn to make guns theid be doomed. Size wouldn't save them in the Mesozoic like it does now. Again; bottle nosed dolphins are MORE intelligent and 3 shark species regularly hunt them

[@robinsonray6766]

@@GRIGGINS1 b. nose dolphins are more intelligent than elephants and they're regularly hunted by 3 species of sharks. Intelligence won't save elephants. Intelligence never saved a species from prey unless said species could make guns and nukes. Elephants would be out of their depth in the jurrasic.

[@robinsonray6766]

@@GRIGGINS1 bn dolphins r still more intelligent than elephants and they're preyed on by 3 shark species. Size saves elephants today. Not in the jurrasic against a pack of allo

[@lincolnfisher5903]

“If you declare with your mouth, “Jesus is Lord,” and believe in your heart that God raised him from the dead, you will be saved.” ‭‭Romans‬ ‭10‬:‭9‬ ‭NIV God bless, turn to Jesus

[@RheaMainz]

I cheer for Livyatan!

[@HeavenlySunsetSkies]

I have great news, God is returning soon, all you need tlo do is repent for your sins,except Jesus as lord and try not to sin again if you do sin that's okay, ask god for forgiveness, we all make mistakes and can learn from therm :)

[@diegoestradahernandez2728]

I disagree that mammoths would lose with ease to saurophaganax you are biased there

[@Distix-uz8qr]

Mammoths historically have shown to go extinct in areas where predators are close to there size and fro a predator about the same size it’s quite reasonable of a conclusion 💀

[@hyrax2330]

​@@Distix-uz8qrwhere on Earth and when in history predators were close to the size of mammoths living with them?

[@11Legorex]

Great vid! I’m glad you aren’t one of the people who make these vids that assume Plesiosaurs are stronger and fiercer than whales just because they’re scary and reptilian. I’m a little shocked Megatherium didn’t reach 5 or 6 though as the burrowing for such a large animal in a world without large burrowers would be a sizable advantage against predators.

[@RheaMainz]

Livyatan's such an outlier that everyone needs to respect it! No other whale that I know of can compare to the ocean king with swords for teeth!

[@josewayneoninguemd7740]

Vividen congratulations for the search and for the vid, it was really good i hope soon you get more and more subs cuz for me you are the best paleontology channel on KZbin