Mahi-mahi (Coryphaena hippurus) have compressed bodies and a single long-based dorsal fin extending from the head almost to the tail. Their caudal fins and anal fins are sharply concave. They are distinguished by dazzling colors: golden on the sides, and bright blues and greens on the sides and back. Mature males have prominent foreheads protruding well above the body proper. Females have a rounded head. Females are also usually smaller than males.