Risso’s dolphin is the largest ‘true’ dolphin without a distinct beak. It has a robust body and a large blunt head. A concave groove runs down the front of the melon from the blowhole to the mouth, which is long and turns upwards towards the eye. As calves Risso’s dolphins are a uniformed light grey without scars, the color darkening to a dun shade in juveniles. Due to extensive scarring typical of the species, particularly in males, adults turn from dark grey through silver-grey to nearly white except on their flippers and flukes. The feed on primarily small, mid-water squid and fish, including lantern fish. They grow up to 3.8 meters and weigh around 500kg.