Smaller than the gray is the red wolf, at roughly 66 centimeters (26 inches ... larger and taller than even these wolves. The heaviest dog breeds are the Old English Mastiff and the St Bernard ...

The gray wolf, a keystone predator whose native range stretches across North America, is an integral link in the food chain of the ecosystems it inhabits. Wolves regulate prey populations, thereby ...

The dog, Canis familiaris, is a direct descendent of the gray wolf, Canis lupus: In other words, dogs as we know them are domesticated wolves. Not only their behavior changed; domestic dogs are ...