How Do Animals Know Which Way is Up?

[@SciShow]

Visit brilliant.org/scishow/ to get started learning STEM for free, and the first 200 people will get 20% off their annual premium subscription.

[@Un_Pour_Tous]

I came to see the owl. No owl. This is click bait

[@EmpressOfExile206]

Can you explain how 2 of the 3 gravity sensing cells in the jellyfish work by sending the information they collect to "brain cells" when jellyfish don't have brains?🧠🤔

[@SinisterMD]

Physician here - fun fact about motion sickness. If you're ever on a plane and there is a lot of turbulence up and down (say on approach or landing) and you're starting to feel sick...just tilt your head 45 degrees to the side. Since you can perceive movement up/down, side to side and back to front very well but not when the system is at a 45 degree angle you will notice that you feel far less motion and therefore should help prevent you from needing that little paper bag in the seat pocket in front of you.

[@francoislacombe9071]

Fun facts: The halteres on flies and mosquitos are modified back wings, and haltere is french for barbell.

[@JohnDrummondPhoto]

Thanks, you beat me to it.

[@chuchu9649]

You both have very French sounding names haha. Thank you

[@JohnDrummondPhoto]

@@chuchu9649 Moi? Mais non. My surname is Scottish.

[@jemmabean]

@@chuchu9649 John Drummond sounds French to you?

[@duckrutt]

Haven't finished watching but When the snail moves quickly is not a phrase I expected to hear today.

[@samwill7259]

Makes me even more curious as to what kind of life would evolve in zero gravity

[@LimeyLassen]

space pigs! 🐖🐖🐖🐖🐖

[@RaymenNumerals]

Elephants the size of a building

[@poppachoppa8956]

joe mama

[@chefhearne]

@@LimeyLassen spider pig

[@maybeanonymous6846]

Let's grow plants in a satellite

[@TBJ1118]

What's even more fascinating is that chordotonal organs were improvised.... they were made on the fly badum-tsss

[@marxtheenigma873]

Imagine a round ish creature with four tentacles. The tentacles can wrap around each other in a way that makes the creature look like a wheel. It can then build up speed on hills. What kind of balancing system would such a creature need to keep it from falling over as it spins? And is there some way to allow the eyes spinning with it to see its surroundings well enough to help it get around?

[@OmateYayami]

To answer the other question. You don't need spinning eyes. Our eyes don't do really smooth movements and the monitors don't really show smooth pictures, yet the brain interpolates the data. You could probably do well with two eyes close to the rotation axis and brainwiring to sample and post-process the vision data properly. Or, few eyes for better vision. If human can make one 3D mental picture from two eyes and it seems smooth on a VR set I see no problem. Also imagine how some animals must see if they have eyes with almost no overlap in field of vision, they probably have one "world view", so I guess mental overlapping is already there in nature. Free rotation is super hard in nature. I am not sure if I know an example on a high-cell-count organism. You'd need to have disconnected tissues.

[@DiscoChixify]

There’s a desert spider that gets around by folding it’s legs into a wheel shape and cartwheeling down dunes. That’s how it covers long distances when it’s hot like mid day in the desert, or when it’s escaping a type of wasp that lays its eggs on spiders. I think the spider is called the Desert Wheel Spider.

[@lyrablack8621]

@@DiscoChixify Golden wheel spider! /info

[@izzyxblades]

Pumpkin toadlets are hilarious!

[@persimonsen8792]

The world, and the creatures on it, are just amazing. Each one with their "quirks'n'feature" (Doug DeMuro(. Amazing, love this little planet, more and more.

[@musicplus6306]

I love this channel been watching since han was the only host i think 6-7 years or so

[@williandalsoto806]

han solo?

[@ChrispyNut]

@@williandalsoto806 Beat me to it (though I was trying to think of the dude from Fast and Furious, but then, Han Solo came to mind, as I clicked to see your reply).

[@ZipplyZane]

There are people without a functional vestibular system who learn to compensate with other balance methods, including visual information and proprioception. It's not nearly a s good, but people manage.

[@jackielinde7568]

Today I Learned: Flies have Pitot tubes and static pressure ports, just like planes.

[@susanlemmey4012]

Others in the comments have had great points too, but I did not notice anyone point out the point at the segue between terrestrial snails and sea snails. Terrestrial snails require a surface to cling onto, but they can climb most surfaces irrespective of orientation, simply following the shape of said surface, meaning they can move in every type of direction at any orientation, just not as freely as a sea snail.

[@EayuProuxm]

2:35 So we're really ignoring that jellyfish have been to space but I probably never will?

[@combatking0]

8:00 - a more puzzling question might be "If a fly goes to space but cannot fly, does it become a walk or a float?"

[@tarmaque]

I think a more pertinent question is, if _I_ go to space, am I a barf or a puke?

[@pierreabbat6157]

Is a ked a fly, even though it can't fly?

[@LA-MJ]

Crickets .. IN SPAAAAACEE!!!!!!

[@Gowithdeath]

Lol snail moving quickly

[@Jeni-ow1kl]

Jellyfish ‘in space’ WOW!!!👀

[@jayceewedmak9524]

Lucky jellyfish!! I'm envious.

[@factacharya01]

Knowledge 🔥

[@y_fam_goeglyd]

So much for "simple life forms", eh? Fascinating creatures!

[@donchonealyotheoneal5456]

Most of all I love the cover photo that is so damn cute but that's what owls do they do cute

[@TremendoJP]

So 🤔 snails can move at different speeds like faster and slower?! Unbelievable. 🤔 hmm 🤔 I would like to watch a running one! 😁

[@bjarkiengelsson]

I have snails - don't ask why, too long, my thumbs would fall off - and they are definitely speedy when they want to be. Especially when you have your back to them.

[@ChrispyNut]

"When the snail moves quickly" .... 🤔 Oh, right, those times when they've slithered up my front door and I move them (if they'll let me) somewhere more ... snail friendly. 👍

[@tylercarlson4571]

she is the best host, does such a great job

[@Mel-be6mg]

I love Rose, and her vibe. She was a lot more chill and natural in the beginning though. I think someone got in her head. Maybe someone at Scishow or some moron like fatsquirrel or Luc. I hope she can tune out the haters and get her groove back. Also who doesn't like Catlin?!? Fatsquirrel needs to find a dog to play with. Scishow Space is clearly hurting without her. With Catlin gone, Hank stealing all the major space news for scishow news and the constant compilations, they just don't seem to care about the channel anymore imo. 😢

[@lucth16]

@@Mel-be6mg "Not liking a host" HOW DARE HE! That moron! "Calling someone a moron" Perfectly normal behavior, carry on. Sorry to have an opinion and not using it to insult people. I'll try and learn from you... you err... You blunderbuss! (did I do it right?)

[@lucth16]

​@@Mel-be6mg Are you delusional? Never deleted any messages. I think we just find out why you can't accept that I don't like her, you live in your own world. As you said; Good luck with all that. P.S. If you think "odd, I was thinking the opposite" is rude, don't go on reddit, ever! P.P.S. Removing notification from this waste of my time thread, no need to reply. "cheers" *Record scratch noise* WTF! You deleted YOUR comment, not me. I'm so confused. Own world indeed.

[@cookingforsingles]

That is the perfect pic for the thumbnail! 😂

[@weldmaster80]

My ears have been messed up for a week and I can barely walk cause my vestibular system is wrecked right now.

[@xXxjayceexXx]

"when the snail moves forward quickly"... 😂

[@stax6092]

Cool.

[@jaypaans3471]

Michael, from Vsauce, has a different theory about "Which way is down?"

[@geo_licious]

Why you gotta expose my little pumpkin toadlet like that T^T

[@jevinrobertson]

Random question Why don't we make a massive ship that would allow us to live in space over trying to fix Mars? Wouldn't it make more sense to make an environment instead of fix one? Also in the search for life wouldn't it make more sense to look for like in ship like structures instead of planets. If we can assume intelligence always destroys it's environment wouldn't it make more sense to build a ship then find a planet that's super similar to your home world?

[@WitmanClan]

Thank you 🙏

[@NavajoNinja]

Why did a jellyfish and a rhopalia walk into a gravity bar... To see whats up.

[@unadomandaperte]

I love how the owl does a Stewie Griffin head tilt.🤣

[@massimookissed1023]

_"Mr Tucker, it seems your son Jake had some vodka at the school dance, and Chris got blamed for it._ _This whole situation has just turned his whole life upside-down face."_

[@bn444]

How do flat-earthers account for stuff like this? I mean, they obviously don't, but...

[@alexvigil7807]

😮

[@MrCoxmic]

when snails move quickly

[@alteria2714]

I’d hope animals know what’s up when I ask them… if I ask what’s up I want to know what’s up!

[@colinmcisaac6263]

5) when something cool happens and they're like "that's what's up"

[@Rob_Gene07]

Fish: 👁👄👁

[@sharonminsuk]

2:50 Um, say what? Jellyfish don't have brains, or even "brain cells". Something must have gotten lost in the translation here.

[@CL-go2ji]

I was wondering about that ...

[@nikolthomas2544]

They have a 'nerve net' , the nerve cells are different than in most other animals but it is still a nervous system.

[@SpaYco]

Humans: by watching VSauce.

[@massimookissed1023]

I unsubscribed from and stopped watching VSauce when he wanted us to pay to watch.

[@PhaydTurellBlack]

Fun drinking game: take a shot every time the word Gravity. Don't do this, you'll probably die...lol

[@theeoneandonlyushygushy]

"but this video isn't about you" ummm okay ✋🏻😭🤚🏻

[@el3ctroshock]

These animals know whazzaaaap

[@CoachJohnMcGuirk]

I just breathe out and watch which way the bubbles go.

[@General12th]

Hi Rose! Quick correction: it's not really the force of _gravity_ that matters here, but your _weight_ force. The reason why you notice gravity less underwater is because you have a significant buoyant force fighting against it, so it feels small. In space, both you and your entire environment are being accelerated by gravity at the same rate, so there's nothing for you to be constantly pushed into: no weight force whatsoever.

[@UnashamedlyHentai]

Weight is a measurement of the force of gravity on a body. It is not a force itself.

[@iprobablyforgotsomething]

It doesn't, but can I cast my vote for a change to "planet-sticky force"? It feels more fun and yet also more instant-self-explanatory than 'gravity' does.

[@redsparks2025]

You can use your mind to fool your mind as to which direction is up. It's fun and freaky.

[@lizardmilk]

Wait! What about the owl in the thumbnail?

[@bemybff205]

The real question is do animals know which direction is updog?

[@jaypaans3471]

(Crickets in space) .. Okay what about Muppets in space?

[@Lord_LindaThePhilosopher]

So are gravity sensor is technically a gyroscope that’s what I looks like lol

[@theflyingdutchguy9870]

if there is simply one thing is would change about youtube. its the damn subtitles randomly turning on for no reason.

[@patrickhannon4217]

Do. You think. She. Might be. Reading. Auto cue? 😅😆😆

[@tuwcouz]

Before I start the video im gonna say this... theres no such thing as up

[@4nrmike]

If your representation of how the semicircular canals work is so obviously flawed, it makes everything else you present suspect.

[@alien9279]

Ths script for this one could use some help

[@chlodnia]

Is that real?

[@WormholeJim]

It takes a human to start wondering which way is up. Just saying. On a round planet that further more is spinning round and round - which way *is* up. Obviously gravity is deciding. "down" is towards the center of the planet, while "up" is directly away from the center. Animals just feel it. Humans, though..

[@akumaking1]

Can animals be moral?

[@katzback24]

Morality is subjective so in a subjective sense, yes animals can be moral.

[@nunyobiznez875]

4:97

[@CL-go2ji]

I´m making an exception and not giving a SciShow video a thumbs up because there are too many mistakes in this one. Good subject; not good research.

[@sol_mental]

Dear scishow, please, I have insect phobia, please show a warning before showing arthropods and preferably only drawings? Thanks for understanding o.O

[@massimookissed1023]

Instead of SciShow changing, just for you, maybe work on overcoming your phobia.

[@sol_mental]

I love the fact that you both actually think my single comment will change something. But hey, a warning wouldn't as well change any experience for you all, would it? You see ads all the time, a small warning is nothing for the continuity.