The heel is the prominence at the posterior end of the foot. The foot is an Anatomical structure found in many Animals It is the terminal portion of a limb which bears weight and allows Locomotion. It is based on the projection of one bone, the calcaneus, behind the articulation of the bones of the lower leg. Bones are rigid organs that form part of the Endoskeleton of Vertebrates They function to move support and protect the various organs of the body produce The calcaneus, or the heel bone is the largest bone of the Human foot. In common usage the human leg is the lower limb of the Body, extending from the Hip to the Ankle, and including the Thigh, the In the long-footed mammals, both the hoofed species (unguligrade) and the clawed forms which walk on the toes (digitigrade), the heel is well above the ground at the apex of the angular joint known as the hock. A digitigrade is an animal that stands or walks on its digits or toes The hock, or gambrel, is the Tarsal joint of a Digitigrade Quadruped, such as a Horse, Cat, or Dog. In plantigrade species it rests on the ground. In Mammals, plantigrade locomotion means walking with the podials and Metatarsals flat on the ground