Boing Boing on MSN2d
What happened to the ancient apex carnivore that suddenly disappeared from the fossil record?
Described as the "king of the ancient Egyptian forest," the hypercarnivorous hyaenodonts were enormous mammals-imagine a ...
HowStuffWorks on MSN6d
The Biggest Bear Stands 5 Feet Tall on All Fours (Not Even on Its Hind Legs)
Polar bears are one of the largest mammals on land; only the African elephant can tower over the polar bear in this corner of ...