Joel Sartore Joel Sartore

National Geographic Photographer and Speaker

Keyword: fork

Photo: Snake wranglers from the 45th annual Mangum Rattlesnake Derby in Mangum, Oklahoma.

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Snake wranglers from the 45th annual Mangum Rattlesnake Derby in Mangum, Oklahoma. This rattlesnake festival takes in between 1,500 and 2,000 pounds of western diamondback rattlesnakes (Crotalus atrox) each year.

Biologists collect samples from a vulnerable (IUCN) and federally threatened bull trout (Salvelinus confluentus) Clark Fork River, Idaho.

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Biologists collect samples from a vulnerable (IUCN) and federally threatened bull trout (Salvelinus confluentus) Clark Fork River, Idaho.

Photo: The Thompson Falls dam, which is currently starting construction to build a fish passage system on the Clark Fork river in Thompson Falls, Montana.

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The Thompson Falls dam, which is currently starting construction to build a fish passage system on the Clark Fork river in Thompson Falls, Montana. Shown is the road way being constructed on the downstream side that will be used to transport heavy machinery.

Armenian viper (Montivipera raddei) at the St. Louis Zoo.

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Armenian viper (Montivipera raddei) at the St. Louis Zoo.

Nikolsky's viper (Vipera nikolskii) at the St. Louis Zoo.

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Nikolsky’s viper (Vipera nikolskii) at the St. Louis Zoo.

Armenian viper (Montivipera raddei) at the St. Louis Zoo.

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Armenian viper (Montivipera raddei) at the St. Louis Zoo.

An endangered Hermon Mountain viper (Vipera bornmuelleri) at the St. Louis Zoo.

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An endangered Hermon Mountain viper (Vipera bornmuelleri) at the St. Louis Zoo.

An endangered Hermon Mountain viper (Vipera bornmuelleri) at the St. Louis Zoo.

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An endangered Hermon Mountain viper (Vipera bornmuelleri) at the St. Louis Zoo.

Armenian viper (Montivipera raddei) at the St. Louis Zoo.

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Armenian viper (Montivipera raddei) at the St. Louis Zoo.

Armenian viper (Montivipera raddei) at the St. Louis Zoo.

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Armenian viper (Montivipera raddei) at the St. Louis Zoo.

A Baird's rat snake (Elaphe bairdi) at the Omaha Zoo.

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A Baird’s rat snake (Elaphe bairdi) at the Omaha Zoo.

A Baird's rat snake (Elaphe bairdi) at the Omaha Zoo.

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A Baird’s rat snake (Elaphe bairdi) at the Omaha Zoo.

A Baird's rat snake (Elaphe bairdi) at the Omaha Zoo.

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A Baird’s rat snake (Elaphe bairdi) at the Omaha Zoo.

A Baird's rat snake (Elaphe bairdi) at the Omaha Zoo.

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A Baird’s rat snake (Elaphe bairdi) at the Omaha Zoo.

A Trans-Pecos rat snake (Bogertophis subocularis) at the Omaha Zoo.

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A Trans-Pecos rat snake (Bogertophis subocularis) at the Omaha Zoo.

A Trans-Pecos rat snake (Bogertophis subocularis) at the Omaha Zoo.

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A Trans-Pecos rat snake (Bogertophis subocularis) at the Omaha Zoo.

A Trans-Pecos rat snake (Bogertophis subocularis) at the Omaha Zoo.

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A Trans-Pecos rat snake (Bogertophis subocularis) at the Omaha Zoo.

Photo: Anatolian viper (Vipera albizona) at the St. Louis Zoo.

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Anatolian viper (Vipera albizona) at the St. Louis Zoo.

Photo: Anatolian viper (Vipera albizona) at the St. Louis Zoo.

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Anatolian viper (Vipera albizona) at the St. Louis Zoo.

Bolkar viper (Montivipera bulgardaghica) at the St. Louis Zoo.

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Bolkar viper (Montivipera bulgardaghica) at the St. Louis Zoo.

Bolkar viper (Montivipera bulgardaghica) at the St. Louis Zoo.

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Bolkar viper (Montivipera bulgardaghica) at the St. Louis Zoo.

Bolkar viper (Montivipera bulgardaghica) at the St. Louis Zoo.

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Bolkar viper (Montivipera bulgardaghica) at the St. Louis Zoo.

A rhinoceros snake (Rhynchophis boulengeri) at the St. Louis Zoo.

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A rhinoceros snake (Rhynchophis boulengeri) at the St. Louis Zoo.

Gloyd’s cantil (Agkistrodon howardgloydi) at the St. Louis Zoo.

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Gloyd’s cantil (Agkistrodon howardgloydi) at the St. Louis Zoo.

Gloyd’s cantil (Agkistrodon howardgloydi) at the St. Louis Zoo.

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Gloyd’s cantil (Agkistrodon howardgloydi) at the St. Louis Zoo.

Gloyd’s cantil (Agkistrodon howardgloydi) at the St. Louis Zoo.

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Gloyd’s cantil (Agkistrodon howardgloydi) at the St. Louis Zoo.

Gloyd’s cantil (Agkistrodon howardgloydi) at the St. Louis Zoo.

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Gloyd’s cantil (Agkistrodon howardgloydi) at the St. Louis Zoo.

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.

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.

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.

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.

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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