Rattlesnakes range in size from 1.5 to 8 feet long (depending upon the species) with dark blotches or diamonds down the back. Their tail ends in rattle, which they hold up and shake when threatened. They “smell” using their tongue, which picks up smells in the air when they flick it in and out. Rattlesnakes are “pit vipers.” This means that they have heat-sensing spots on the sides of their heads that helps them find warm-blooded prey.
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Amsel, Sheri. "Rattlesnake Drawing Lesson" Exploring Nature Educational Resource ©2005-2019. September 20, 2019
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