Biologist Peter Wimberger holds an ice worm in the snow. Nell Greenfieldboyce/NPR hide caption
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Though they're called ice worms, the creatures Hotaling (right) and his colleagues study on the glaciers of Mount Rainier can't handle the slightest bit of freezing. If temperatures dip even slightly below zero degrees Celsius (32 degrees Fahrenheit), Hotaling says, the worms die. Peter Wimberger hide caption
It's Summer, And That Means The Mysterious Return Of Glacier Ice Worms
A Sherpa fetches ladders for climbers attempting to summit Mount Everest. Tashi Sherpa/AP hide caption