Bison are among the most powerful land mammals in North America, capable of sprinting at surprising speeds despite their massive size. Their muscular necks, heavy skulls, and sharp horns are built for ...

The isolated, white-furred wolves of Ellesmere Island, Canada, are distinctive among their species in that they have not been conditioned over generations to fear humans. On the second closest land ...

The wolf, known as BEY03F, roamed more than 500 miles from Northern California, signaling that the species continues to rebound after being wiped out in the state in the 1920s. By Livia Albeck-Ripka ...