The Galápagos Islands are already famous for their unique reptiles, from giant tortoises to rock-dwelling marine iguanas. Now, scientists have announced the discovery of three new geckos to add to the list—and one of them lives on a volcano.

A team of U.S. and Ecuadorian herpetologists recently found one of the leaf-toed geckos during a grueling expedition to Wolf Volcano, the most remote of the five volcanoes on Isabela, the largest island of the Galápagos archipelago.

"It takes a long, very expensive expedition, and once you get there you have to climb the slopes of the volcano, which takes a lot of effort, and a big team,” says herpetologist Alejandro Arteaga, director of science for the