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

American Dipper.
Photo By Dave Menke / Usfws
American Dipper.
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