Reptiles include goannas, snakes, dragon lizards, skinks and geckos. Common leopard geckos are larger than many other gecko species. Several native species of skinks, geckos and monitor lizards are still found on the island. Among reptile species there are crocodiles, geckos, cobras, Burmese pythons, and turtles. It feeds mainly on geckos and lizards. Many lizards, including geckos and skinks, are capable of shedding their tails (autotomy). Animals that are ubiquitous throughout the island include frogs, toads, geckos, skinks, and butterflies. Goannas, snakes, geckos, skinks and frogs are all present on the island. Like all reptiles, common leopard geckos shed their skin. The first fossils of geckos, skinks and snakes appear in the Middle Jurassic. In Brunei, frogs, geckos and skinks have been found in the pitchers of this species. Prey includes small vertebrates, such as geckos and green anoles, as well as insects. Some species, like geckos and chameleons, adhere to vertical surfaces including glass and ceilings. Common leopard geckos are one of the most popular lizard pets. Of these, a majority are skinks with a smaller number of geckos and agamids.