Most Penn students know that black squirrels are a common sight on campus now, but the unofficial fixtures of campus culture were likely introduced to Penn over 200 years ago. “Black squirrels” — a ...
Near Toolik Field Station in northern Alaska, an arctic ground squirrel pokes its head out of a burrow. Credit: Oivind Toien/University of Alaska Fairbanks Near Toolik Field Station in northern Alaska ...
Arctic ground squirrels are unique among mammals. Their ability to keep from freezing even when body temperatures dip below that mark on the thermometer enables them to survive extreme winter climates ...
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