Why Male Mammoths Lost the Game (w/ TierZoo!)

The Island of Shrinking Mammoths

When the Synapsids Struck Back

Secrets of the Dinosaurs: The Real Jurassic Americas (Full Episode) | Drain the Oceans

Why Insects & Plants Have a Complicated Relationship

The Insane Evolution of: Life in the Arctic

When Bats Took Flight

The Mystery Behind the Biggest Bears of All Time

When Birds Had Teeth

Why Do Deep Sea Creatures Evolve Into Giants?

How South America Made the Marsupials

Rise of the Mammals FULL SPECIAL | PBS America

How Sloths Went From the Seas to the Trees

Testing a Hamster's Survival Skills

When Mammals Only Went Out At Night

When Penguins Went From The Sky To The Sea

The Island of Huge Hamsters and Giant Owls

When We First Walked

From the Fall of Dinos to the Rise of Humans

Mysteries of the Twilight Zone | Worlds of the Deep

The Forgotten Story of the Beardogs