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Peter Mather
Before the study, scientists thought lynx maintained territories of about 20 square miles.
A Canada lynx blends into snow-covered willows in southern Yukon Territory, Canada.
A grizzly bear grips a freshly caught salmon in Canada's Yukon Territory.
Migrating birds and a rainbow appear over the Arctic Ocean, along the coast of Alaska's Arctic National Wildlife Refuge.
An arctic fox, Alopex lagopus, in tall grasses. Its coat is changing from winter white to summer brown.
An aerial view of lands within the Arctic National Wildlife Refuge.
The 180,000-strong Porcupine caribou migrate thousands of miles each year to reach their calving grounds on the coastal plains of Alaska. The calving grounds are threatened by potential oil and gas development.
Musk oxen put up a defensive ring around their young in Alaska's Arctic National Wildlife Refuge.
A man watches the northern lights above the city of Whitehorse in Canada's Yukon Territory.