The Risso's Dolphin (Grampus griseus) is a species of dolphin.
It is found worldwide in temperate and tropical waters, usually in deep waters rather than close to land.
The most obvious feature of this large (up to 3.8m) dolphin is the large dorsal fin, superficially like that of a young or female Killer Whale. The main body colour is very variable, from dark grey in young animals to almost white in old adults. The underside is of this heavily built animal is white. Older animals are usually heavily scarred from confrontations with other Risso's or with squid.
The head profile is almost square, somewhat like a Sperm Whale, and the flippers are long and tapering. It will form moderately sized groups, and will mix with other dolphins, but it is not particularly attracted to ships.
The Risso's Dolphin eats mainly squid and fish.