The smallest gray wolf subspecies in North America, the Mexican gray wolf is also one of the rarest and most imperiled mammals on the continent. The U.S. Fish and Wildlife Service (and its predecessor ...

is one of the largest and most deadly grey wolf subspecies. This wolf, which may weigh up to 175 pounds, lives in North ...

Depending on which ones are counted, there are thought to be nearly 40 subspecies of wolf. Adult gray wolves are thought to be the biggest; females typically weigh between 23 to 55 kilograms (51 ...