The Grey Fox (Pseudalopex griseus), for the most part, lives a solitary and primarily nocturnal lifestyle. For refuge and for raising its pups it will occupy a cave built earlier by a Hairy Armadillo (Xenarthra) or other burrowing animal or in the hollow of a tree if found. They are territorial animals and will mark their area with urine or feces. They have a wide diet and are opportunistic feeders, taking advantage of the situations that may arise they will eat mammals, birds, eggs, reptiles, insects and a good portion of fruit and vegetable matter.