From the Wikipedia entry.
Avicularia is a genus of the family Theraphosidae containing various species of tarantulas. The genus is native to tropical South America. Each species in the genus has very distinguishable pink foot pads.
One of the most notable features of the Avicularia species is their odd method of defense. When threatened, their first choice is to jump or run away as quickly as possible – occasionally, though, they will launch a jet of excrement at the perceived threat. Adults are capable of good accuracy and a range of 0.5–1 m (2 to 3 feet).