Tarantulas are arachnids belonging to the Family Theraphosidae. There are over 800 documented tarantula species in the world, all of which feature hairy exteriors and many of which have large bodies. In the United States, tarantulas are most commonly found in dry, desert habitats. U.S. tarantulas do not spin aerial webs in order to catch food. Rather, they hunt for prey and ambush it from their burrows.