this post was submitted on 05 Oct 2024
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683
Comparative anatomy (slrpnk.net)
submitted 1 month ago by [email protected] to c/[email protected]
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[–] [email protected] 2 points 1 month ago

They absolutely did.

[–] [email protected] 4 points 1 month ago

+1 Terrifying

[–] [email protected] 36 points 1 month ago

[–] [email protected] 6 points 1 month ago (1 children)

Imagining a TRex with enormous bunny-shaped ears

[–] [email protected] 6 points 1 month ago (1 children)

Does the penguin fly? Mass/per/volume is a thing...

[–] [email protected] 4 points 1 month ago (1 children)

Mass per volume is density, and I suspect the Trex and kangaroo are similar (~1000 kg/m^3) so yes they'd both bounce in that case. I think what you're looking for is surface area to volume, which decreases rapidly as an object gets larger while maintaining geometry.

[–] [email protected] 4 points 1 month ago

It's worth noting that most extinct dinosaurs were probably more similar to surviving ones (i.e., birds) than to mammals and reptiles when it comes to bones and respiratory systems, and, by extension, density.

That is to say, they probably could get that big because they were quite literally full of air.
Some of them (especially sauropods, but maybe also other big species like tyrannosaurs) probably had even more complex and efficient air sac systems than modern birds...

[–] [email protected] 73 points 1 month ago (4 children)

I've seen a lot of little birds hop around. Not only are birds dinosaurs, but the particular birds I've seen hopping are very similar in shape to a T Rex.

[–] [email protected] 20 points 1 month ago* (last edited 2 weeks ago) (1 children)

Or like a pigeon with its head motion while walking.

[–] [email protected] 2 points 2 weeks ago (1 children)

with its* head motion

[–] [email protected] 2 points 2 weeks ago* (last edited 2 weeks ago)

Yes, you're right. Corrected.

[–] [email protected] 24 points 1 month ago (2 children)

My chickens run around very similar to the run we see of T-Rex/raptors in movies. They lean forward and low and run surprisingly fast for an animal with wings that they just tuck.

[–] [email protected] 5 points 1 month ago

Yeah, that seems more likely from what I know about dinosaurs. Just saying, we already have birds who hop to compare to. The kangaroo idea just strikes me as silly

[–] [email protected] 9 points 1 month ago* (last edited 1 month ago) (1 children)

Have you ever seen a real roadrunner?

[–] [email protected] 9 points 1 month ago (2 children)

Seen one? I've caught one.

[–] [email protected] 10 points 1 month ago

I heard it takes a super genius to do that.

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