Grampus griseus (Risso’s Dolphin)
Grampus griseus (G. Cuvier, 1812)
Medium-sized species. Body robust, especially anterior to the dorsal fin. Head prominent and blunt; the melon is broad, square in profile, and creased at the front by a longitudinal groove, a feature unique to this species. This groove becomes more prominent with age. The skin covering this groove…