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Updated: May 5, 2025
The South American rattlesnake the Boaquira crotalus horridus has the rattle placed at the end of the tail. It consists of several dry, hard, bony processes, so shaped that the tip of each upper bone runs within two of the bones below it. By this means they have not only a movable coherence, but also make a multiplied sound, each bone hitting against the others at the same time.
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