Goliath Birdeater Spider

Diet
Despite its name, the Goliath birdeater does not normally eat birds. As with other tarantulas, their diet consists primarily of insects and other invertebrates. However, because of its naturally large size, it is not uncommon for this species to kill and consume a variety of vertebrates. In the wild, larger species of tarantula have been seen feeding on rodents, frogs, lizards, bats and even venomous snakes.
In captivity, the Goliath birdeater's staple diet should consist of cockroaches (generally the Dubia cockroach, Blaptica dubia). Spiderlings and juveniles can be fed crickets or cockroaches that do not exceed the body length of the individual. Feeding of mice is discouraged as such food contains excess amounts of calcium which can be harmful or even fatal to a tarantula.