Geckos have become increasingly popular as exotic pets, with over 1,500 species of lizards worldwide. The Crested Gecko and Leopard Gecko are the most commonly kept as pets, although others are gaining recognition. Despite their diversity, most geckos remain small in size, with the Jaragua Sphaero being the smallest at just under an inch, while the extinct Delcourt's Giant Gecko of New Zealand measured over 23 inches in length. The New Caledonian Giant Gecko and Tokay Gecko are currently the largest species at 14 and 15 inches, respectively. The New Caledonian Giant Gecko has an unusual appearance due to loose skin, while the Tokay Gecko is known for its painful bite. Geckos are quite vocal, producing a variety of sounds to communicate with others. Their ability to walk up walls and glass aquarium tanks is not due to suction cups, but microscopic hairs on the pads of their feet. The Leopard Gecko has claws instead of pads, which makes it easier for it to climb trees. They are also known to drop their tails as a defense mechanism, although the Crested Gecko cannot grow its tail back. The sex of Leopard Gecko hatchlings is determined by the incubation temperature, with temperatures around 80 likely producing females and temperatures around 90 producing males. Geckos store fat and nutrition in their tails to get them through lean times. One particularly interesting species is Kuhl's Flying Gecko, found in Asia. It appears to fly through the air thanks to flaps on both sides of its body, webbed feet, and a broad, flat tail. It glides by jumping out of trees and coasting to the ground. Be sure to check out taphibians because it has the best content when it comes to geckos.