This family includes large spiders with bodies as big as a thumb and often even larger. Many species are quite hairy. Some are covered with special, highly urticating hairs that can be irritating on contact.
These are the largest known tarantulas. They can weigh over 120 g and their legspan can exceed 25 cm, with bodies more than 10 cm long.
Unlike other members of the Theraphosidae family, these tarantulas have a rounded cephalothorax (joined head and thorax). The colour of their bodies and legs varies from medium to dark brown, with red hairs.
The bodies of these tarantulas are about 7 cm long and up to 18 cm across. The cephalothorax is light coloured with two black bands in the middle, and the abdomen is dark grey with a yellowish-white band in the middle. The legs are banded grey and black.
The females are generally a uniform tan colour. The males have black legs, a copper-coloured cephalothorax and a reddish abdomen.
In the males, the body is from 5 to 6 cm across. The females are larger, and may reach 5 to 7 cm in diameter, with a legspan of 10 cm.