Mammals use their sense of touch in different ways. Tactile interactions are important for intraspecific communication, well known to a human who has benefited from the comfort of a hug. Often, touch plays an important role in female mammals recognizing their infants. Seal pups often reunite with their mothers by exchanges of vocalizations that terminate in nuzzling. Grooming often involves touching, such as in two chimpanzees (Pan troglodytes) carefully stroking and picking at each other’s fur.
Primates have an especially well-