Risso’s Dolphin

Risso’s Dolphin

Grampus griseus

 This species grows to 3.9 m long, and has:
  • No beak and a broad head
  • A tall, often raked, hooked dorsal fin
  • Colouration is variable. Dark to pale
  • Scarring visible on the sides of many adults and occasionally juveniles
  • Long flippers

Risso’s dolphin is widely distributed throughout the world’s temperate and tropical waters, ranging from Newfoundland, the Gulf of Alaska and the North Sea, south towards South America, Southern Africa, Australia and New Zealand.

Fun fact: Risso’s dolphins are also the only species of cetacean to possess a distinct vertical crease on its forehead.

Risso’s dolphin is also found in a number of partially enclosed waters, including the Red Sea, Gulf of Mexico and Mediterranean Sea.

They appear to migrate northwards during winter, with some individuals sighted as far north as the Gulf of Alaska and the Shetland Islands.

Diet:
  • Squid
  • Crustaceans
  • Cuttlefish
Estimated population:

Unknown

IUCN Listing:

Least Concern