Rancidification, the oxidation of fats, fatty acids, and edible oils
Items observed in the diets of Ceuthophilus species include jelly, tuna, rancid liver, American cheese, pet food, oatmeal, wheat germ, peanut butter, molasses, wild fungi, persimmon, bread, dead and living insects, insect eggs, arachnids, dead bats, dead ring-tailed cats, and human feces.