Masturbation
Techniques used vary: Manual stimulation using hands, paws, feet, or tail is common, but autofellatio also occurs: Animals rub their penis against the belly, or against other objects. Some species have been known to make tools that help them masturbate. Some species have shown to ejaculate spontaneously, without being stimulated first. Certain species are known to also stimulate other erogenous zones, such as the nipples, or the antlers in deer. Female mammals often masturbate by stimulating the clitoris, which is present in all mammal species.