Season 4
The Island of the Last Surviving Mammoths
The very last mammoths that ever lived experienced what’s known as a mutational meltdown.
The Island of the Last Surviving Mammoths
The Traits That Spawned the Age of Mammals
Some Mammal Traits Show Up a Lot Earlier and in Things That Weren’t Mammals at All.
The Traits That Spawned the Age of Mammals
Did These Giant Sloths Poop Themselves to Death?
Find out if Sloths Really Did Poop Themselves to Death.