Why did giant animals (dinosaurs) existed but not giant humans?

[Anonymous]

[RedTiefling]

This is an ongoing question, It's not answered in entirety yet.

Most of the mass in theropod dinosaurs were around the hips, they had long muscular tails and a sort of "suspension bridge" style ligaments that helped hold up their mass.

With sauropods it gets CRAZY. Those things were the biggest animas to ever walk the earth. There's some guesses that they used some kind of air sac breathing system. But realistically we don't know how they were possible, but yet there are the bones right there.

Imagine how powerful those hearts were to pump blood tens of feet up towards their heads.

I love dinosaurs 🦕

[RedTiefling]

Oh right, the human "shape" runs into the volume to surface area problem.

The more the surface area increases on the outside the inner volume then must increases cubed.

[DryGermanGuy]

I beg to differ! And yes, that's Ah-nuld in the middle. :-D

[Anonymous]

Because humans (and mammals in general) would not have been able to get enough of the kinds of nutrients they need each day to support their complex brains, so they were only able to grow to a certain size. The blue whale has unlimited access to these kinds of nutrients in the ocean, so it was able to grow to be the largest mammal (and largest animal) on Earth.

[Nikki1989]

Dinosaurs were giants of a different evolutionary class with different body plans and superior respiratory systems. Humans are highly restricted by physiological limits.

[NoDecision]

You also noticed that they are all extinct too, so size was their downfall.

[jahaims]

Because of the environment we evolved in. The atmosphere and all kinds of environmental conditions were different when dinosaurs evolved compared to humans.

[Anonymous]

I heard that current living birds in the 21st century are dinosaurs. They are generally smaller than humans.

[Anonymous]

Because God created all species to be a particular size, not to "evolve" into larger or smaller sizes

[mysteriousNicholas]

God was 👀 busy

Shrugs

[Anonymous]

Apparently giant humans did exist!