Western Diamondbacks are pit vipers. This means that they have a heat sensing pit (loreal pit) located behind each nostril that can detect differences in temperature, sometimes differences that are only a fraction of a degree apart. The heat given off by an animal is detected by the snake helping it to determine predator from prey.
This one was in the U.S. State of Arizona's Tonto National Forest.
August 17th, 2020
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