Experts say nineteen percent of reptiles face extinction
15 February 2013 Last updated at 12:33 GMT
The Zoological Society of London says nearly a fifth of the world's reptiles are facing extinction.
In a study of reptiles including crocodiles, lizards, snakes, tortoises and turtles, researchers found that half of freshwater turtles are close to extinction while the jungle runner lizard may already have died out.
Dr Monika Bohm, lead author of the paper written with the IUCN Species Survival Commission, spoke to BBC Radio 5 live Breakfast.