The information below is general and there may be a difference between species. As always, check with the breeder where you bought your spider as to the conditions of care. Tarantulas make interesting pets and can be useful as well. They have been placed in windows to keep unwanted people away such as the jewelry storeowner who was robbed many times. He purchased a tarantula to keep in his display case at night and he hasn't been robbed since.
Many people believe that tarantulas are deadly poisonous.
This is not so. The tarantula secretes a fluid through the salivary glands, which is injected into its prey using their fangs. The fluid is actually a digestive enzyme, which digest the prey from the inside out, which turns the tissues into liquid. The tarantula sips his liquid out of the shell of the victim, which is undigested. These secretions will kill insects, young birds, and mice but will only cause pain and swelling in humans.