Horses have been so strongly bred by humans that there is extensive variability in their size and weight. The general body pattern is that of long limbs, barrel shaped body, and a long neck supporting a large head. Vision and hearing are key senses for these animals, as suggested by their large eyes and ears. Coloration is also hightly variable due to breeding, and individuals range from pure white, tan, brown or black to patches of oranges and browns on white. The tail is relatively short but has long hairs coming off it that frequently reach the ground.
Horses graze while walking slowly, pulling off a mouthful every few steps.
Reproduction Horses are seasonal breeders, but during the breeding season come into estrus monthly until impregnated. Birth, usually of one foal occurs after an 11 month gestation period. In about 15-25 minutes the foal is able to follow its mother around, and it stays close to her side for the first few days of life. Behavior Horses have a harem social system, where one dominant male has a group of several females and their offspring. There is current debate as to whether both male and female juveniles leave the natal group, or if only males leave.