Chameleon

 Any of a group of mostly arboreal (tree-dwelling) Old World lizards notable for their ability to alter body colour (family Chamaeleonidae). Chameleons also have zygodactylous feet (toes fused into opposing bundles of two and three), acrodont dentition (tooth attached to the edge of the jaw), independent eyes, atrophied venom glands that produce harmless trace amounts of venom, and a long, slender projectile tongue. The false chameleon, commonly known as an anole, is a New World lizard belonging to the genus Anolis (family Iguanidae).Bradypodion, Brookesia, Chamaeleo, and Rhampholeon are the four genera of real chameleons. Some researchers have identified two additional genera (Calumma and Furcifer).chameleon, Any member of the Chamaeleonidae family of predominantly tree-dwelling Old World lizards, distinguished primarily by its ability to change body colour. Toes fused into opposite bundles of two and three, teeth linked to the jaw edge, glands secreting a weak, harmless venom, and a long, slender, extensile tongue are among the other characteristics. About half of the 150 species are unique to Madagascar; the rest are primarily found in Sub-Saharan Africa with a few exceptions. The majority of them are 7–10 in. (17–25 cm) length and have a flattened body from side to side. The bulged eyes move on their own. Each species can go through a specific range of colour changes. The major food source is insects, but larger species also eat birds.