Balanced on a rock in the middle of a river, a black bear lowers her head to the water and … chomp! A wriggling salmon is no match for her strong jaws. She’s spent the summer eating berries and ...

A 40-foot-long predator stomps through a forested valley in what’s now western North America, following its nose: The animal sniffs a tasty Triceratops nearby. Moving quickly—about 12 miles an ...