Learn more about the giant short-faced bear, and how it would have fared against saber-tooth cats and other Ice Age predators ...

The big brown bat is the Adirondack’s largest bat; only the hoary bat is larger. The long, lustrous fur is brown. The ears, wing and tail membranes are black. Total length is 105-123 mm (4.1-4.8 in).

"Everything big bit it," says Kirk Johnson of the Denver Museum of Nature & Science. "The key to survival was to be small." Mammals fit that profile. They suddenly found themselves in a world ...

The loss of big mammals in Africa could also explain other extinctions that have been blamed on our ancient ancestors. For example, some scientists have suggested that increasingly carnivorous ...

We are researching the cause of megafaunal extinction in the last major extinction event. Hundreds of large mammal species disappeared during the transition from the last glaciation to the present ...