A young adult Motaguan flat headed rattlesnake ( Crotalus simus ) starting to rev its engines in Tropical Dry Forest, Zacapa Department, Guatemala. Despite both Guatemalan rattlesnakes ( C. simus  and  C. tzabcan ) being used in traditional medicine as cancer treatments, these snakes are not danced like Hopi rattttlesnakes ( C. viridis nuntius ) further north. Image: F. Muller.
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