Visitors to Yellowstone National Park were shocked when they saw what appeared to be a dog with a collar running loose in the area—only to realize it was a large black wolf. Marcela, a national parks ...

The gray wolf, also called the timber wolf, is the largest member of the canine family with fur ranging from gray to brown, black or white. Smithsonian's National Zoo and Conservation Biology ...

Wolves and dogs don’t normally breed in the wild, largely because wolves are so territorial. But an exception has been found. While wild dog-wolf hybrids had previously only been suspected through ...