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An Arizona black rattlesnake, Crotalus cerberus, at the Sedgwick County Zoo.

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An Arizona black rattlesnake, Crotalus cerberus, at the Sedgwick County Zoo.

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A Western Chihuahuan ridge nosed rattlesnake (Crotalus willardi silus) at the Knoxville Zoo.

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Arizona black rattlesnake (Crotalus oreganus cerberus).

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Arizona black rattlesnake (Crotalus oreganus cerberus).

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A Southern ridge-nosed rattlesnake (Crotalus willardi meridionalis).

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The tail end of a Southern ridge-nosed rattlesnake (Crotalus willardi meridionalis).

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A Southern ridge-nosed rattlesnake (Crotalus willardi meridionalis).

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Arizona black rattlesnake (Crotalus oreganus cerberus).

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Arizona black rattlesnake (Crotalus oreganus cerberus).

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Arizona black rattlesnake (Crotalus oreganus cerberus).

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Arizona black rattlesnake (Crotalus oreganus cerberus).

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Southern pacific rattlesnake (Crotalus oreganus helleri) at the Santa Barbara Zoo.

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Southern pacific rattlesnake (Crotalus oreganus helleri) at the Santa Barbara Zoo.

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Southern pacific rattlesnake (Crotalus oreganus helleri) at the Santa Barbara Zoo.

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San Lucan speckled rattlesnake (Crotalus mitchellii mitchellii) at the Omaha Zoo.

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An Arizona black rattlesnake (Crotalus cerberus) at the Omaha Zoo.

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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 Venezuelan or Colombian rattlesnake (Crotalus durissus cumanensis) at the Buffalo Zoo, Buffalo, New York.

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A Venezuelan or Colombian rattlesnake (Crotalus durissus cumanensis) at the Buffalo Zoo, Buffalo, New York.

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A Venezuelan or Colombian rattlesnake (Crotalus durissus cumanensis) at the Buffalo Zoo, Buffalo, New York.

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

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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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An Aruba Island rattlesnake (Crotalus durissus unicolor) at the Saint Louis Zoo. It is one of the only rattlesnake taxon to benefit from a true captive breeding program worldwide. It is nearly extinct on Aruba Island where it is endemic.

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An Aruba Island rattlesnake (Crotalus durissus unicolor) at the Saint Louis Zoo. It is one of the only rattlesnake taxon to benefit from a true captive breeding program worldwide. It is nearly extinct on Aruba Island where it is endemic.

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An Aruba Island rattlesnake (Crotalus durissus unicolor) at the Saint Louis Zoo. It is one of the only rattlesnake taxon to benefit from a true captive breeding program worldwide. It is nearly extinct on Aruba Island where it is endemic.

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An Aruba Island rattlesnake (Crotalus durissus unicolor) at the Saint Louis Zoo. It is one of the only rattlesnake taxon to benefit from a true captive breeding program worldwide. It is nearly extinct on Aruba Island where it is endemic.

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

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