The

things in AZ like mothballs. And peppermint. And please note that feline feces don't deter them in the slightest.
Real snakes are welcome, as they're far preferable to the rat

things.
The Badcat

caught one last time we were at the ranch and I had to rescue him from it. It was fighting back and attempting to shred him, while showing every indication of success.
Squirrels pack your truck with nuts. Rat

things pack your truck in a matrix of rat turds saturated with urine, with cactus spines interspersed to complicate removal.
I truly hate them.