Which taxonomic Order includes all snakes and lizards, such as *Crotalus oreganus*?
Answer
Squamata
The hierarchical classification of *Crotalus oreganus* places it within the Order Squamata. This specific Order is the group within the Class Reptilia that encompasses all lizards and snakes worldwide. The Suborder Serpentes represents the snakes within this larger order. Viperidae is the Family designation, which separates true vipers from other snake families, and Crotalinae is the subfamily specific to pit vipers. Therefore, Squamata is the correct, broader grouping that unites snakes and lizards.
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