00:00This squirrel just heated up its own tail on purpose
00:02to fight a snake that hunts using heat vision.
00:08Rattlesnakes hunt using heat-sensing pits.
00:10The squirrel deliberately pumps extra blood into its tail.
00:14This makes it look bigger and more threatening in infrared.
00:17It's a bluff based entirely on biology.
00:21And against a heat-hunting predator,
00:23it works more often than you'd expect.
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