A heavy-bodied American pit viper with a series of horny rings on the tail that produce a characteristic rattling sound when vibrated as a warning.
- Genera Crotalus and Sistrurus, family Viperidae: several species
- Those were some of the most dangerous kinds of reptiles, spitting cobras, rattlesnakes, Komodo dragons.
- Clark says timber rattlesnakes and other pit vipers may be the most social of all snakes.
- They're even immune to the venom of rattlesnakes and other pit vipers.
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