Tarantulas comprise a group of large and often hairy arachnids belonging to the Theraphosidae family of spiders, of which approximately 900 species have been identified. This article only describes members of Theraphosidae, although some other members of the same infraorder (Mygalomorphae) are commonly referred to as "tarantulas". Except in cases of anaphylaxis (severe allergic reaction), no species of tarantula are dangerous to humans, and some species have become popular in the exotic pet trade.[1]