Prehistoric Planet 2 - How Did Dinosaurs Get So Big? | Apple TV+

Prehistoric size had very few limits. Prehistoric Planet Season 2 is now streaming on Apple TV+ apple.co/_Prehistoric
Narrated by Sir David Attenborough, and featuring an original score by multiple Academy Award winner Hans Zimmer, the captivating exploration of ancient Earth will debut with five all-new episodes in a week-long event.
Subscribe to Apple TV’s KZbin channel: apple.co/AppleTVKZbin
Follow Apple TV:
Instagram: / appletv
Facebook: / appletv
Twitter: / appletv
Giphy: giphy.com/AppleTV
Follow Apple Films:
Twitter: / applefilms
More from Apple TV: apple.co/32qgOEJ
Apple TV+ is a streaming service with original stories from the most creative minds in TV and film. Watch now on the Apple TV app: apple.co/_AppleTVapp Subscription required for Apple TV+
#PrehistoricPlanet #Uncovered #AppleTV

[@pharoahcaraboo9610]

the dinosaurs' secret was being bird relatives. hollow bones, efficient metabolism... and sauropods were very efficient eaters on top of that. rake-like mouths, with their long necks, meant they could stand in one place and browse foliage at a wide radius without moving.

[@UnwantedGhost1-anz25]

I hope they do Palaeoloxodons next. The biggest elephants ever to have existed. Probably more than even Paraceratheriums.

[@rampage75_25]

Dreadnoughtus? Hm... "I leave only rubble" "None shall block our path"

[@PikachuIno]

I wish a Alamosaurus as toy

[@PikachuIno]

I mean a scale toy of this Alamosaurus in this episode

[@DanielMartin-lz1ys]

I'm not suggesting that gravity was lower in the past, but if you look at animals similar in size or larger than elephants, they seem to be more lightly built. For example, the Paraceratherium, which was larger than an elephant, is not as robust. Similarly, duck-billed dinosaurs of comparable size or bigger also appear to be more lightly built than elephants.

[@Mrkreebbs]

Epic

[@EmeraldChaos270]

These People Are Legends

[@Frenchylikeshikes]

I have always had a hard time understanding how reptiles went to be so gigantic, to be so tiny (for most of them) nowadays.

[@eybaza6018]

Dinosaur anatomy was supremely well adapted for gigantism. Pneumatized bones with air spaces and more efficient respiratory systems.

[@trvth1s]

The reptiles of today with sprawling legs existed back then and they were small back then as well. You can't compare iguanas to dinosaurs

[@mp2764]

There is a lot less air now which caused us to be smaller is what I read. Everything was bigger

[@trvth1s]

@@mp2764 that's not true. Where did you read this?

[@juanyusee8197]

Modern reptiles lacked the needed adaptations that allowed sauropods to grow so big + Extant megafauna niche has been occupied by mammals first after the K-Pg.

[@Jon-bv7nl]

the fact David Attenborough is Richard Attenborough brother and Richard atten. played John Hammond in Jurassic park

[@mrwest5552]

answer : steaks medium rare, cheese burgers with bacon, lamb chops and cheesecake.

[@user-ze3lk1ov5b]

The weird thing is that most dinosaurs species are medium to small size animals while an infamous minority of them is big animals

[@fransiscayayuk3526]

🦕

[@EmeraldChaos270]

🦖🦕

[@kaitokid_1412]

Maybe there something in prehistoric phase of the earth environment which would help them...

[@trvth1s]

They were just big because there was a lot of food and they were good at being big. Ornithischians were very similar to mammals in bone structure and food ingestion, but egg laying allowed them to survive extinction better than mammals even when big, so you had a lot of large ornithischians. Sauropods, unlike mammals and ornithischians, did not have to chew their greens allowing them to ingest more greens, thus they got huge. Theropods had so much giant sauropods and large ornithischians to eat they could get huge for predators.

[@hanamichi9044]

The answer is food.

[@elnovillomapuchedehomerus2412]

The answer is always food, it also explains why theropods had small arms as a way to not accidentally hurt each other during a food frenzy and got infections.

[@GalvyTheTom]

@@elnovillomapuchedehomerus2412That’s not actually why we think they had small arms. We think their arms grew relatively small to allow them to grow their heads much larger and still keep their bodies balanced - balance would have been incredibly important for large predators like theropods, and prioritizing their heads meant they could focus on evolving those into efficient weapons and not overweigh their front halves through shrinking their arms.

[@jirou6228]

Maybe in the past there is more Oxygen for them to growth

[@jonathankennedy1963]

Oxygen levels doesn't actually do that, not in the way you think. Sure, It was the case for insects, but it's because they have a weird way of respiration. Their size is limited to the amount of oxygen they can get. Dinosaurs were a different story. At the time, the oxygen was lower than today's. The reason why they were so big is mostly 2 reasons: respiration and reproduction. Dinosaurs had the most efficient lung system in all animals, the avian respiratory system. They have air sacs in their bones, allowing for more sustained energy, and at the same time, it allowed them to be relatively lightweight for their size, enabling them to get really big. Theropods, Pterosaurs, and Sauropds have this respiratory system as well as birds. Reproduction in dinosaurs were fast as they can have a large cluster at once, allowing for more variety and increased survival of offspring.

[@dibershai6009]

There wasn't more oxygen in the Mesozoic period. One of the reasons that sauropods could grow so big is due to their birdlike lungs which allowed them to breathe in more oxygen.

[@trvth1s]

@@jonathankennedy1963 Hollow bones may have also been a factor, hollow bones are more structurally stronger than bones full of marrow. Another very important factor is feeding method. Sauropoda, unlike ornithischians, elephants and hornless rhinos, do not need to chew their greens allowing for more caloric intake.

[@jonathankennedy1963]

@@trvth1s I did mention the bones, yeah. And yes, I forgot to mention the efficient digestion of sauropods.

[@juanyusee8197]

​@@jonathankennedy1963Worth pointing out that oxygen levels probably isn't even the case for gigantism in arthropods, as there are times that land/flying arthropods were around without high oxygen levels (the largest _Arthropleura_ specimen was found in rocks before the oxygen levels in the Carboniferous skyrocketed, and it as well giant griffinflies were initially still around during the early Permian).

[@jamesburke6078]

I can give you a 100 points on why I think rex attacked from the bank or water... you might be able to give me 2 for why it didn't! Whole idea is absolutely absurd 😮

[@jamesburke6078]

I want to make a point then I will leave you alone,I live in the Appalachian mountains, nothing is moving in the mountains without fear of breaking a leg... not deer... I've seen them break their legs trying to run in the mountains...I can't move through the foliage with any grace... what makes anyone think a 5 ton predator is doing it? How dumb can anyone be?

[@jamesburke6078]

Before you put me off as a nay sayer remember that the same type of educated people are saying a man can be a woman 😂...and even dumber stuff than that...