It is descended from bipedal dinosaurs

Sunday, August 21st, 2022

Ostriches, unlike humans, can run very fast on two legs:

Their legs are all bone and tendon. They don’t have any muscles in their legs or feet. All the muscles are up in the body. It allows their legs to go faster — ostriches can run 45 miles an hour.

A human foot has 26 individual bones in it. And you have two feet, so you have 52 foot bones. That means a quarter of your skeleton is made of foot bones. Tons and tons of foot bones.


We are primates, and primates live in trees. And in trees, you need a mobile foot. Think about an orangutan’s foot, a chimpanzee’s foot. They can use their foot in the same way that I use my hand to grab onto things.

The bones that we have in our foot are the exact same 26 bones that a chimpanzee has. They’re just tweaked a little bit, and that converts our foot from a grasping organ, like a chimpanzee’s, into one that can push off the ground. But we still have those 26 individual bones. And what are the results? Well, you get plantar fasciitis, you get an ankle sprain.


Think about the ostrich lineage. It doesn’t come from an ape or a primate. It is descended from bipedal dinosaurs. The bones of their ancestors’ feet have fused together into a single, rigid column. They only have eight bones in their feet, so there’s less capacity for motion. Instead, their foot looks a lot like the Paralympic prosthetic blade that athletes use with that single rigid structure that can hit the ground, store elastic energy and then push off the ground and propel them into their next step.


  1. Wilbur Hassenfus says:

    By examining the human foot, we can discern that God is a German.

  2. Grasspunk says:

    My chickens are also descended from dinosaurs and when they run they half-fly like a farm ekranoplan.

  3. Isegoria says:

    Yes, chickens are Ground-Effect aVians.

  4. Jim says:

    Wilbur Hassenfus: “By examining the human foot, we can discern that God is a German.”


  5. Jim says:

    And what of the humble kangaroo?

  6. TRX says:

    Primates typically have hands. Some of them, better than sapiens. And they have four of them. When the Sapiens left the trees and ventured out into the grasslands, natural selection favored the ones who could move about flat surfaces more efficiently.

    The upper arms shrank to dwarfish length and size, barely able to support the weight of the body when brachiating. The lower arms grew grotesquely oversized to support the weight, and the lower hands lost most of their flexibility, and the fingers are vestigial.

    The Sapiens eventually became quite efficient long-distance runners. One in good health can run a deer or horse into the ground.

    All primates have hands. But the Sapiens’ grotesquely deformed lower hands give them mobility no other primate has.

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