Outdoors
OUTDOORS Alaska Science Forum On the upper Chena River in the heart of a cold winter, a songbird appeared on a gravel bar next to gurgling water that somehow remained unfrozen in 20-below zero air. Then the bird jumped in, disappeared underwater, and popped up a few feet upstream.

Alaska Science Forum: American Dipper swims throughout Alaska winters

 An American dipper on the Sanctuary River in Denali National Park.
Photo By Ned Rozell
An American dipper on the Sanctuary River in Denali National Park.
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