Size of the Tarantula
The tarantula is the largest documented spider. Among the more than 800 tarantula species, average body size ranges from 2 to 30+ cm. However, the bodies and legs of these spiders are covered in dense hair, which causes them to appear much larger than they actually are. One of the largest tarantula species is Theraphosa apophysis.
By virtue of its size, the tarantula is a formidable predator. Most tarantulas feed on insects and arthropods such as grasshoppers and grubs. Some species are also capable of consuming small birds and rats. These larger specimens are commonly referred to as bird-eating spiders, though birds are not a main part of their diet. In confronting enemies, tarantulas rear up to display their oversized mandibles in warning.