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Furthermore, what eats a mouse in the desert?
The sidewinder (Crotalus cerastes), also known as the horned rattlesnake, competes for a tasty bite of mouse with the common barn owl (Tyto alba) and great horned owl (Bubo virginianus), all of which are major predators of pocket mice. Some flesh-eating mammals also prey on them sometimes -- think weasels and coyotes.
Subsequently, question is, do pack rats eat cactus?
Primarily nocturnal and vegetarian, desert Woodrats survive on a diet of spiny cactus, yucca pods, bark, berries, pinyon nuts, seeds and any available green vegetation.
Mice will eat just about anything, but most prefer plant parts. The grasshopper mouse, however, is a ferocious carnivore. It eats grasshoppers, beetles, spiders, centipedes, millipedes, worms, lizards, scorpions, snakes, and other mice. In the photo below, it is eating a bark scorpion.