Drained lake basins make up more than half of the Arctic coastal plain, but the complete drainage of a lake is rarely witnessed by people.

Beavers live in every province of Canada, every U.S. state and into northern Mexico. Range maps now need to be redrawn to include areas north of treeline in Alaska and Canada.

The answer to the Tang-colored mystery involves tiny spruce needle rust fungus spores that also rely on Labrador tea plants to survive.

Alaska’s tundra landscapes carpet a good portion of the state, from the North Slope to the elbow of the Alaska Peninsula. Researchers say it's slowly sinking in places -- as much as a fifth of an inch each year.

Because ice makes up a good portion of the underground foundation of northern Alaska, thawing has dropped the landscape as much as 3 feet in some places.

Department biologists do not keep track of coyote numbers, but Fairbanks-area trapper Randy Zarnke said coyotes began showing up on his trapline trails three or four years ago.

The open ocean off Utqiagvik in fall and early winter is evidence of climate change. Remarkably, bowhead whales appear to be thriving, although there are new challenges. Kidney-worm infections have been detected in bowheads, possibly brought by other species of whales coming north. And then there are the killer whales, a natural predators of bowheads now venturing north.

Staring out into the darkness, she and her husband Ivan saw "an enormous ball of light in the sky to the west. It was moving north to south, and was quite big."

Ticks that infest red squirrels, snowshoe hares and a variety of birds have always been present in Alaska, but a team of biologists and veterinarians recently found five non-native ticks on Alaska dogs and people.

Researchers are finding ticks in Alaska that haven't historically been here. Some hitchhiked from the Lower 48—but others seem to have settled in.

In northern Alaska, an amphitheater of frozen ground thaws where a northern river cuts into it, exposing walls of ice. The feature, known by scientists as “yedoma,” is the largest of its kind yet found in Alaska. A great wall of ice holds a lot of treasures from the past, which science is eager to explore.

In Two Rivers,at a time when the outside air’s temperature has not been above freezing since October — three butterflies living in a heated garage.