animal Asian Asian wild horse color coloration colored coloring coloured colouring distinctive Dzungarian horse endangered equine equus ferus przewalskii grazer grazing herd-animal horse mammal mane mongolian Mongolian wild horse preservation rare short-legged small stocky strong sturdy takh upright-mane wild horse subspecies colt horses nature outdoors pasture wild bronco mustang pony ranch silhouette wild horse Africa animals fur mare pattern stripe stripes wildlife zebra zebras black white zoo garden