The endangered Humpback Chub (Gila cypha) boasts a streamlined body. The name comes from the prominent hump positioned between the head and dorsal fin. Its body is covered with very few scales which are positioned only along the lateral line. The tail is deeply forked, while the caudal peduncle is thin. It is silver on its sides, white on the belly, and light olive-gray on the back. The anal fin has ten rays and the dorsal fin nine rays. It is found in the Colorado River system in the USA. The skull is concave, fins large and curved, and the snout overhangs the mouth. The Humpback Chub has a body that is deep and compressed.