One known species of Tarantula is native to the Navajo Nation. These large hairy spiders are typically found in mid-elevation pinon-juniper forests. They live alone, but tend to gather and move in large numbers in early autumn. It is suspected that these activities are done for mating and preparation for the upcoming winter. These large spiders will attack just about any potential prey item it thinks it can subdue, including insects, other spiders, mice and small lizards.

Tarantula is named "Naał'aashii" in the Navajo language. Tarantula and other invertebrates are said to have been created in the First World in Navajo tradition. They should be respected and not killed. It is said that Tarantula comes around autumn and starts walking to forecast the amount of upcoming winter snow and cold weather.