What are some living things in the desert and their important information?

Scorpions:"Scorpions have eight legs, a pair of pincers (pedipalps) and a narrow segmented tail that often curves over their back, on the end of which is a venomous stinger." -google way of writing it

or 

tarantulas:"They eat insects, beetles and grasshoppers. The Goliath Bird-eating Tarantula species will eat larger prey, such as, lizards, snakes, frogs, bats and small birds" -google way of writing it