Groundbreaking study reveals the most threatened reptile species

Photos: One-fifth of all reptile species are at risk of extinction

The endangered mountain horned agama (Ceratophora stoddartii) is endemic to Sri Lanka.

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Photos: One-fifth of all reptile species are at risk of extinction

A critically endangered ploughshare tortoise (Astrochelys yniphora) is shown in the wild at Baly Bay Nature Preserve in Madagascar.

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Photos: One-fifth of all reptile species are at risk of extinction

A critically endangered gharial, or fish-eating crocodile (Gavialis gangeticus), is shown in India.

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Photos: One-fifth of all reptile species are at risk of extinction

The king cobra (Ophiophagus hannah) is listed as vulnerable on the IUCN Red List. King cobras are distinguishable from other cobras by their size and neck patterns.

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Photos: One-fifth of all reptile species are at risk of extinction

A mugger crocodile (Crocodylus palustris) is shown in India. The species is listed as vulnerable on the IUCN Red List.

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Photos: One-fifth of all reptile species are at risk of extinction

A critically endangered Jamaican iguana (Cyclura collei) is shown in the Hellshire Hills on the southern coast of Jamaica.

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