Denali National Park has closed to visitors due to the rapidly spreading Riley Fire near its entrance, prompting evacuations and a significant firefighting response.

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

Small spiny growths on a rosebush resemble spiny galls created by cynipid wasps.

There are over one hundred and forty landslides along the Denali Park road, the 92 mile road through Denali National Park and Preserve. None are more threatening than the Pretty Rocks Landslide at Polychrome Pass.

Kettle ponds in Denali National Park contain less water this spring than in previous years, due to low snowfall and permafrost thaw. Shrubs are replacing grasses as the lakes dry.

A worker in Kantishna glimpsed the rare phenomenon in which hundreds of Alaska gnat snakeworm larvae formed a crawling column.