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Adult Risso's dolphins (Grampus griseus) surfacing in Monterey Bay National Marine Sanctuary, California, United States of America, North America

Adult Risso's dolphins (Grampus griseus) surfacing for a breath in Monterey Bay National Marine Sanctuary, California, United States of America, North America

Adult Risso's dolphin (Grampus griseus), leaping into the air in Monterey Bay Marine Sanctuary, California, United States of America, North America

Adult Risso's dolphins (Grampus griseus), surfacing near shore in Monterey Bay Marine Sanctuary, California, United States of America, North America

Risso's dolphin (Grampus griseus) with its eye and blow visible and characteristic scarring over its body and dorsal fin. Hebrides, Scotland.

Rissos Dolphin (Grampus griseus) adult and very young calf surfacing. Monterey, California, Pacific Ocean. MORE INFO: This calf still displays foetal folds from when it was curled up inside the womb. It is probably only a couple of weeks old.

Mixed pod of Striped, Common and Risso's dolphins (Stenella coeruleoalba, Delphinus delphis, Grampus griseus) the only permenant symbiosis of these species to be recorded, Gulf of Corinth, Greece.

Risso's dolphin (grampus griseus). A Risso's dolphin showing the blunt head, tall dorsal fin and common scarring. Mediterranean Sea

Risso's dolphin (Grampus griseus) showing typical percussive behaviour: repeatedly leaping out of the water to land with a loud splash. Hebrides, Scotland.

Risso's dolphin, Grampus griseus, at the surface in the Azores showing multiple scars along its back (RR)

Pair of Risso's Dolphin, Grampus griseus, swimming off the Azores. Note the groove in the melon (RR)

Risso's dolphin (grampus griseus). A pair of Risso's dolphin showig typical scarring and colouration. Mediterranean Sea

Risso's dolphin (Grampus griseus) with its eye and blow visible and characteristic scarring over its body. Hebrides, Scotland.

Risso's dolphin (Grampus griseus) surfacing at speed with eye and natural scarrin visible. Monterey Bay, California, USA