Glass lizards have a thin and fragile glass-like appearance because of their translucent scales. They get their name from their tendency to break into pieces when handled. Glass lizards are Old World lizards in the family Anguidae. There are 16 species, all found in Europe, Asia, and Africa. Snakes are elongated, legless, carnivorous reptiles that can be distinguished from lizards by their lack of eyelids and external ears. Snakes are often mistaken for worms or slugs. There are about 3,400 species of snakes, accounting for about 60% of all squamate species. The majority of snakes live in the tropics and subtropics.