Mammals, mainly rodents and rabbits, are the mainstay of the diet in most places. However, a wide range of vertebrate and invertebrate food is eaten including earthworms, beetles, the young of ground nesting birds, and human scraps. Lambs are found around red fox dens, but in many cases the victims are known to be sickly or stillborn. Red foxes use their ears to locate the rustle of a mouse in the grass and then launch themselves in a pounce to land on their prey. Other food items appear to picked up opportunistically as they traverse their territories at night.