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A Northwestern neotropical rattlesnake (Crotalus culminatus) at the Gladys Porter Zoo in Brownsville, Texas. This is a xanthic specimen, lacking normal pigmentation.

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A Northwestern neotropical rattlesnake (Crotalus culminatus) at the Gladys Porter Zoo in Brownsville, Texas. This is a xanthic specimen, lacking normal pigmentation.

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A Northwestern neotropical rattlesnake (Crotalus culminatus) at the Gladys Porter Zoo in Brownsville, Texas. This is a xanthic specimen, lacking normal pigmentation.

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A federally threatened New Mexico ridge-nosed rattlesnake, Crotalus willardi obscurus, at the Arizona Sonora Desert Museum.

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A federally threatened New Mexico ridge-nosed rattlesnake, Crotalus willardi obscurus, at the Arizona Sonora Desert Museum.

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A federally threatened New Mexico ridge-nosed rattlesnake, Crotalus willardi obscurus, at the Arizona Sonora Desert Museum.

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A federally threatened New Mexico ridge-nosed rattlesnake, Crotalus willardi obscurus, at the Arizona Sonora Desert Museum.

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A federally threatened New Mexico ridge-nosed rattlesnake, Crotalus willardi obscurus, at the Arizona Sonora Desert Museum.

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A western diamondback rattlesnake (Crotalus atrox) in the foothills of the Wichita Mountains in Oklahoma. Studies are showing that rattlesnakes that have the genetic tendency to migrate are being killed in ever-increasing numbers on our nation’s roads, leaving those snakes with non-migrating tendencies behind to breed.

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A western diamondback rattlesnake (Crotalus atrox) in the foothills of the Wichita Mountains in Oklahoma. Studies are showing that rattlesnakes that have the genetic tendency to migrate are being killed in ever-increasing numbers on our nation’s roads, leaving those snakes with non-migrating tendencies behind to breed.

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A western diamondback rattlesnake (Crotalus atrox) in the foothills of the Wichita Mountains in Oklahoma. Studies are showing that rattlesnakes that have the genetic tendency to migrate are being killed in ever-increasing numbers on our nation’s roads, leaving those snakes with non-migrating tendencies behind to breed.

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A western diamondback rattlesnake (Crotalus atrox) in the foothills of the Wichita Mountains in Oklahoma. Studies are showing that rattlesnakes that have the genetic tendency to migrate are being killed in ever-increasing numbers on our nation’s roads, leaving those snakes with non-migrating tendencies behind to breed.

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A western diamondback rattlesnake (Crotalus atrox) in the foothills of the Wichita Mountains in Oklahoma. Studies are showing that rattlesnakes that have the genetic tendency to migrate are being killed in ever-increasing numbers on our nation’s roads, leaving those snakes with non-migrating tendencies behind to breed.

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A western diamondback rattlesnake (Crotalus atrox) in the foothills of the Wichita Mountains in Oklahoma. Studies are showing that rattlesnakes that have the genetic tendency to migrate are being killed in ever-increasing numbers on our nation’s roads, leaving those snakes with non-migrating tendencies behind to breed.

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A western diamondback rattlesnake (Crotalus atrox) in the foothills of the Wichita Mountains in Oklahoma. Studies are showing that rattlesnakes that have the genetic tendency to migrate are being killed in ever-increasing numbers on our nation’s roads, leaving those snakes with non-migrating tendencies behind to breed.

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A western diamondback rattlesnake (Crotalus atrox) in the foothills of the Wichita Mountains in Oklahoma. Studies are showing that rattlesnakes that have the genetic tendency to migrate are being killed in ever-increasing numbers on our nation’s roads, leaving those snakes with non-migrating tendencies behind to breed.

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A western diamondback rattlesnake (Crotalus atrox) in the foothills of the Wichita Mountains in Oklahoma. Studies are showing that rattlesnakes that have the genetic tendency to migrate are being killed in ever-increasing numbers on our nation’s roads, leaving those snakes with non-migrating tendencies behind to breed.

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A Durangan rock rattlesnake (Crotalus lepidus maculosus) at the Houston Zoo, Houston, Texas.

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A Durangan rock rattlesnake (Crotalus lepidus maculosus) at the Houston Zoo, Houston, Texas.

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A Durangan rock rattlesnake (Crotalus lepidus maculosus) at the Houston Zoo, Houston, Texas.

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A Durangan rock rattlesnake (Crotalus lepidus maculosus) at the Houston Zoo, Houston, Texas.

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A Durangan rock rattlesnake (Crotalus lepidus maculosus) at the Houston Zoo, Houston, Texas.

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A Durangan rock rattlesnake (Crotalus lepidus maculosus) at the Houston Zoo, Houston, Texas.

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A Central Plateau dusky rattlesnake (Crotalus triseriatus triseriatus) at the San Antonio Zoo, San Antonio, Texas.

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A Central Plateau dusky rattlesnake (Crotalus triseriatus triseriatus) at the San Antonio Zoo, San Antonio, Texas.

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An eastern twin-spotted rattlesnake (Crotalus pricei miquihuanus) at the San Antonio Zoo, San Antonio, Texas.

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An eastern twin-spotted rattlesnake (Crotalus pricei miquihuanus) at the San Antonio Zoo, San Antonio, Texas.

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An eastern twin-spotted rattlesnake (Crotalus pricei miquihuanus) at the San Antonio Zoo, San Antonio, Texas.

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An eastern twin-spotted rattlesnake (Crotalus pricei miquihuanus) at the San Antonio Zoo, San Antonio, Texas.

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A cross-banded mountain rattlesnake (Crotalus transversus) at the San Antonio Zoo, San Antonio, Texas.

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A cross-banded mountain rattlesnake (Crotalus transversus) at the San Antonio Zoo, San Antonio, Texas.

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A Central Plateau dusky rattlesnake (Crotalus triseriatus triseriatus) at the San Antonio Zoo, San Antonio, Texas.

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A cross-banded mountain rattlesnake (Crotalus transversus) at the San Antonio Zoo, San Antonio, Texas.

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A southwestern speckled rattlesnake (Crotalus pyrrhus) at the LA Zoo.

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A southwestern speckled rattlesnake (Crotalus pyrrhus) at the LA Zoo.

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A southwestern speckled rattlesnake (Crotalus pyrrhus) at the LA Zoo.

Photo: Julie Jensen Director of Marketing | WVC O: 866.800.7326 | D: 702.443.9249 | E: j.jensen@wvc.org

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