The Evolution of the Heart
11:46
Evolution of Live birth (Why do mammal not lay eggs?)
10:28
How Blood Evolved (Many Times)
9:48
Why Are Animals Symmetrical?
15:53
What Actual Aliens Might Look Like
9:56
Why did Birds Lose their Teeth?
18:22
The Insane Biology of: The Narwhal
11:44
The Evolution of Frogs
17:55