Arabian horses have triangle-shaped heads, a wide forehead, big eyes, large nostrils, and small muzzles (noses). Most have a concave or "dished" profile. They have a slim, arched neck, smooth hindquarters and a naturally high-carried tail. Arabians have strong bone and good feet. They are especially noted for their excellent endurance. Arabians' hair coat colors are bay, gray, chestnut, and black. Arabians can have robicono and/or sabino genes. All Arabians have black skin under their hair coat, except under white markings. 