Pod of Atlantic spotted dolphins porpoising at surface (Stenella frontalis) Azores, Atlantic Ocean

Risso's Dolphin, Grampus griseus, swimming off the Azores Islands

Risso's Dolphin, Grampus griseus, breaching off the Azores Islands

Risso's Dolphin, Grampus griseus, pair swimming off the Azores Islands

Atlantic Spotted Dolphin (Stenella frontalis) group In front of Pico. Azores

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

Risso's dolphin (Grampus griseus) lost inside Monterey harbour, Monterey Bay, California, USA

Risso's dolphin (Grampus griseus) breaching. National marine sanctuary, Monterey bay, California Pacific ocean, USA.

Risso's dolphins (Grampus griseus) surfacing in tight group showing scarred backs and fins. Canary Islands, North Atlantic.

Risso's dolphin (Grampus griseus) spy hop. National marine sanctuary, Monterey bay, California Pacific ocean, USA.

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

Risso's dolphin (Grampus griseus) breaching, Monterey Bay, California, Pacific Ocean, USA, National Marine Sanctuary

Risso's Dolphin (Grampus griseus). Pembrokeshire, Wales, UK

Risso's dolphin (Grampus griseus) three calves playing, fatal folds, teeth and tail fluke are clearly visible Monterey Bay, California, USA, Pacific Ocean, National Marine Sanctuary

Risso's dolphin (Grampus griseus) close look at a calf surfacing and blowing Monterey Bay, California, USA, Pacific Ocean, National Marine Sanctuary

Risso's dolphin (Grampus griseus) close look at a calf surfacing next to its mother, fetal folds are visible. Monterey Bay, California, USA, Pacific Ocean, National Marine Sanctuary

Pod of Risso's dolphins surfacing (Grampus griseus) Azores, Atlantic Ocean