Snakes in the snow: The resilience of the rubber boa.

This ability to function in chilly weather, somewhat atypical in ectotherms, has allowed them to carve out a niche in areas of the world otherwise inhospitable to their close kin—and even their more distant reptilian affiliates. Specimens captured while out and about—not hibernating—have been measured as having body temperatures as low as 54°F.