Origin Stories cover image

On Two Feet

Origin Stories

CHAPTER

Why Did We Stand Up From All Fours?

Carol says by walking on the ground, our ancestors had way more food options to choose from. Carol believes that when the forest began shrinking, animals that used to spend all their time in trees started spending their time on the ground. Chimps and gorillas' bodies were specialized to move in trees. For them, standing upright didn't make sense. Our ancestors just never dropped down all fours. They were already upright when they lived in trees.

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