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It's the reason we have so many birth complications. Why do you think we are the only animal on the planet that is bipedal all the time? It's actually really mind bending how we survived and thrived
Technically...birds are bipedal all the time. They went about it very differently though.
Birds have optimized for minimum weight tho, so they can afford to only have 2 limbs supporting the entire body
Have you seen their legs though? They dont look sufficient at all, especially taller birds which stand in the water often have insanely thin legs
Keep in mind that most of the bird's visible body volume is just fluff
Birds like egrets and herons rarely weigh more than a few pounds. Even the red-crowned crane, a five foot tall bird, caps out at about twenty pounds. An average nine-month-old human weighs that but is only a foot and a half tall. Flighted birds are crazy light.
Wow, that is indeed crazy. I knew birds were light, but that's still impressive
They're also dinosaurs, so definitely not mammals.
haha got me there should have said mammals
We are just too stubborn to die out.
Figured out the one trick Nature didn't want you know - evolution can be circumvented by sheer ignorant willpower.
Not only we're the only bipedal mammal, we have the biggest head relative to our body out of any animal. That combination is just not a good time for anyone involved