Brazilian White Knee Tarantula Acanthoscurria geniculata We have captive bred Brazilian white knee tarantulas for sale at the lowest prices online. This popular giant bird-eating species attains a huge legspan of nearly 10-inches. They have long lifespans, and thrive in captivity on a diet of insects. Watch out, because this arachnid grows very quickly! They are also known as giant white banded tarantulas. When you buy a tarantula from us, you automatically receive our 100% live arrival guarantee.