Two grey wolves, Yellowstone National Park, Wyoming, United States

Yellowstone National Park, Wyoming, United States

Two grey wolves move through the sagebrush of Yellowstone National Park in Wyoming, home to some of North America's most closely watched wolf packs. Their thick coats help them withstand harsh winters, and their keen senses make them skilled hunters and communicators.

Grey wolves are highly social animals that typically live in family groups, or packs, and work together to hunt, defend their territory and raise their young. After disappearing from Yellowstone in the early 20th century, they were reintroduced to the park in 1995 as part of a landmark conservation effort that restored the species to one of its most iconic habitats.

Today, Yellowstone remains an important place for studying these predators and their role in the ecosystem. The park's long-term monitoring has revealed how wolves interact with prey, other predators and scavengers, offering scientists a rare opportunity to observe a recovering wolf population over decades.