Sixty million years ago—the dawn of their Age—Titanoides was the biggest of mammals, about the size of a polar bear. Stout, thick-legged, big-tailed, weighing half a ton, probably a fine ...

Not only can these gentle giants turn their heads and look at you, but they do so with near-human facial expressions and big, imploring eyes. Belugas reach lengths of 11 to 15 feet and can weigh ...

"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 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).

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 ...