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Rattlesnakes are the venomous snakes forming the genera Crotalus and Sistrurus of the subfamily Crotalinae. All rattlesnakes are vipers. The scientific name Crotalus is derived from the Greek κρόταλον, meaning "castanet". While a rattlesnake may warn you of his presence with a rattle of his tail, which would be a lucky scenario, most snakes are silent. When the snake spirit animal appears in your life, it likely means that healing opportunities, change, important transitions, and increased energy are manifesting. … Snake could appear as a spirit animal when you are stepping into the unknown and need support to move forward.