How did feathers evolve?

How the Turtle Got Its Shell

How did teeth evolve?

When Fish First Breathed Air

How Did Land Animals Evolve?

How Did Human Hearing Evolve?

The Evolution of Human Birth

How Blood Evolved (Many Times)

When Insects First Flew

When Penguins Went From The Sky To The Sea

How Did Dinosaurs Get So Huge?

How the Squid Lost Its Shell

How Sloths Went From the Seas to the Trees

The Origin of Four-Legged Animals

The Evolution of the Heart (A Love Story)

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The Origin of Flight--What Use is Half a Wing?

Which Came First - Flowers or Bees?

How Did This Evolve?

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Why do humans have a third eyelid?

The evolution of animal genetalia