This article was originally featured on High Country News. Packs are to wolves as families are to humans: They’re the species’ most essential social structure. The dynamics of a wolf pack — who its ...

New research shows how humans are a substantial source of mortality for wolves that live predominantly in national parks — and more importantly, that human-caused mortality triggers instability in ...

A wolf stands in the road at Yellowstone National Park. Data collected by researchers shows just over a third of the collared wolves living primarily in five protected national parks died of ...

SPRINGERVILLE — Allison Greenleaf, a senior wildlife biologist for the U.S. Fish and Wildlife Service, had squeezed herself into a narrow hole dug among the rocks of a steep mountainside in Arizona's ...

Among the attributes that made Pleistocene wolves and our early human ancestors so sympatico was their devotion to family—their pack. At its base, the pack consists of the breeding pair, Ma and Pa; ...

A gray wolf (not the one pictured) was struck and killed by a vehicle on June 13 in the Umpqua National Forest in Oregon, wildlife officials said. U.S. Fish and Wildlife Service. A young gray wolf was ...