The species of brazilian spider's are vary in color, though all are hairy and mostly brown and gray, although some species have lightly colored spots on their abdomen. Many species have bands of black and yellow or white on the underside of the two front legs, according to the University of Florida, brazilian spiders can be 1 feet tall wich it means they can be really big of a adult's hand or even 10 inches more wich is actually scary.