Mark Carwardine / Risso's dolphin surfacing {Grampus griseus} The Maldives

Sue Flood / Risso's dolphins off California coast (Grampus griseus) Pacific USA

DOC WHITE / Aerial Blue whale at sea surface {Balaenoptera musculus} swimming with two Risso's dolphins, Mexico

Doug Perrine / Risso's dolphins underwater {Grampus griseus} white skin due to scarring from fighting, Azores, Portugal, North Atlantic (Non-ex).

Espen Bergersen / Rare sighting of Risso's dolphin (Grampus griseus) photographed just before midnight. Outside Andoya, Northern Norway. November.

Espen Bergersen / Risso's dolphin (Grampus griseus) and fulmar photographed just before midnight. Outside Andoya, Northern Norway. November.

Doc White / Risso's dolphin (Grampus griseus) female and calf aged two days, swimming at surface. California, USA.

Doc White / Risso's dolphin (Grampus griseus) female and calf aged two days, swimming at surface. Calf with head out of water, many scars on female. California, USA.

Doc White / Risso's dolphin (Grampus griseus) female and calf aged two days, swimming at surface, exhaling. California, USA.

Doc White / Risso's dolphin (Grampus griseus) female and calf aged two days, swimming at surface. California, USA.

Mark Carwardine / Pod of Risso Dolphin (Grampus griseus) at surface, Baja California, Mexico.

Sue Daly / Risso's crab (Xantho pilipes) Sark, British Channel Islands, September.

Hiroya Minakuchi / Risso's Dolphin (Grampus griseus) breaching, Monterey Bay, California

Hiroya Minakuchi / Risso's Dolphin (Grampus griseus) surfacing, Monterey Bay, California

Hanne & Jens Eriksen / Risso's dolphin (Grampus griseus) breaching, Oman, November

Suzi Eszterhas / Risso's dolphin (Grampus griseus) surfacing, Baja California, Mexico

Suzi Eszterhas / Risso's dolphins (Grampus griseus) two surfacing, Baja California, Mexico

Suzi Eszterhas / Risso's dolphin (Grampus griseus) surfacing, Baja California, Mexico

Suzi Eszterhas / Risso's dolphin (Grampus griseus) group of four surfacing, Baja California, Mexico

Suzi Eszterhas / Risso's dolphin (Grampus griseus) surfacing, Baja California, Mexico

Rebecca Robinson / Illustration of the diving and breaching behaviour of Rissos Dolphin (Grampus griseus).

Hiroya Minakuchi / Risso's Dolphin (Grampus griseus), white morph, surfacing, Japan

Hanne & Jens Eriksen / Risso's dolphin (Grampus griseus) two at surface, Oman, October

Yumiko Wakisaka / Risso's Dolphin (Grampus griseus)

Hiroya Minakuchi / Risso's Dolphin (Grampus griseus) breaching, Monterey Bay, California

Sue Daly / Risso's crab (Xantho pilipes) on sea shore, Guernsey, British Channel Islands.

Kevin Schafer / Risso's Dolphin (Grampus griseus) with scarred back, Channel Islands, California

Hiroya Minakuchi / Risso's Dolphin (Grampus griseus) pod surfacing, California

Hiroya Minakuchi / Risso's Dolphin (Grampus griseus) surfacing, California

Mark Carwardine / Risso's dolphin surfacing to breathe {Grampus griseus} The Maldives

Mark Carwardine / Risso's dolphin breaching {Grampus griseus} The Maldives

Roland Seitre / Risso's dolphin (Grampus griseus) spyhopping. The Azores.

Chris Gomersall / 2020VISION / Greater black-backed gull (Larus marinus) perched on corpse of a Risso's dolphin (Grampus griseus) near the Cairns of Coll, Inner Hebrides, Scotland, UK, July 2011

Chris Gomersall / 2020VISION / Underwater photographer Alex Mustard photographing a dead Risso's dolphin (Grampus griseus) near the Cairns of Coll, Inner Hebrides, Scotland, UK, July 2011

Hiroya Minakuchi / Risso's Dolphin (Grampus griseus) pod, California

Hiroya Minakuchi / Risso's Dolphin (Grampus griseus) pod, California

Hiroya Minakuchi / Risso's Dolphin (Grampus griseus) pair surfacing, California

Hiroya Minakuchi / Risso's Dolphin (Grampus griseus) pair surfacing, California

Hiroya Minakuchi / Risso's Dolphin (Grampus griseus) in aquarium with open mouth, Japan

Hiroya Minakuchi / Risso's Dolphin (Grampus griseus) in aquarium with open mouth, Japan

Hiroya Minakuchi / Risso's Dolphin (Grampus griseus) leaping out of water, Japan

Wild Wonders of Europe / Lundgren / Risso's dolphin (Grampus griseus) surfacing with fin showing scarring, Pico, Azores, Portugal, June 2009

Wild Wonders of Europe / Lundgren / Risso's dolphin (Grampus griseus) at surface, Pico, Azores, Portugal, June 2009

DOC WHITE / Aerial view of Blue whale (Balaenoptera musculus) and Risso's dolphins (Grampus griseus) Mexico

DOC WHITE / Blue whale (Balaennoptera musculus) and two risso dolphins (Grampus griseus) riding the whale's nose wake, Channel Islands National Park, California, Pacific

Doug Perrine / Risso's dolphin {Grampus griseus} breaching off San Diego, California, USA

Sue Flood / Risso's dolphin off California (Grampus griseus) Pacific USA

Sue Flood / Risso's dolphins off California (Grampus griseus) Pacific USA

Sue Flood / Risso's dolphins off California (Grampus griseus) Pacific USA

Doug Perrine / Pod of Risso's dolphins {Grampus griseus} Azores, Atlantic

Todd Pusser / Breaching Rissos dolphin {Grampus griseus}, Ligurian Sea, Italy.

Todd Pusser / Rissos dolphins at surface {Grampus griseus} Ligurian Sea, Italy.

Todd Pusser / Risso's dolphin surfacing {Grampus griseus}, Monterey Bay, California, Pacific Ocean

Todd Pusser / Risso's dolphin surfacing {Grampus griseus}, Monterey Bay, California, Pacific Ocean

Todd Pusser / Risso's dolphins {Grampus griseus} Monterey Bay, California, USA.

Todd Pusser / Risso's dolphin {Grampus griseus} Monterey Bay, California, USA.

Flip Nicklin / Risso's Dolphin (Grampus giseus) breaching on pacific side of Costa Rica

Flip Nicklin / Risso's Dolphin (Grampus giseus) jumping out of water, Costa Rica

Flip Nicklin / Risso's Dolphin (Grampus giseus) breaching on Pacific side of Costa Rica

DOC WHITE / Aerial view of Blue whale {Balaenoptera musculus} and Risso dolphins, Mexico

Sue Flood / Risso's dolphin at surface {Grampus griseus} Monterey Bay, California, USA May 1999

TOM WALMSLEY / Risso's dolphin skeleton {Grampus griseus} Isle of Mull, Scotland, UK

Colin Seddon / Risso's dolphins at surface {Grampus griseus}, Shetland Islands, UK

Colin Seddon / Risso's dolphin at surface {Grampus griseus}, Shetland Islands, Scotland, UK

Colin Seddon / Risso's dolphins {Grampus griseus} Scotland, UK

Jeff Foott / Risso's Dolphin (Grampus griseus) surfacing, North America

Chase Dekker / Risso's Dolphin (Grampus griseus) jumping, Monterey Bay, California

Chase Dekker / Risso's Dolphin (Grampus griseus) tail slapping, Monterey Bay, California

Chase Dekker / Risso's Dolphin (Grampus griseus) surfacing, Monterey Bay, California

Chase Dekker / Risso's Dolphin (Grampus griseus) jumping, Monterey Bay, California

Hiroya Minakuchi / Risso's Dolphin (Grampus griseus) trio surfacing, Monterey Bay, California

Suzi Eszterhas / Risso's Dolphin (Grampus griseus) mother and calf surfacing, Monterey Bay, California

Suzi Eszterhas / Risso's Dolphin (Grampus griseus) group surfacing, Monterey Bay, California

Suzi Eszterhas / Risso's Dolphin (Grampus griseus) group surfacing, Monterey Bay, California

Hiroya Minakuchi / Risso's Dolphin (Grampus griseus) calf and mother surfacing, fetal folds visible on calf, California

Hiroya Minakuchi / Risso's Dolphin (Grampus griseus) pair showing scars, California

Kevin Schafer / Risso's Dolphin (Grampus griseus) surfacing, Santa Barbara Channel, Channel Islands National Marine Sanctuary, California

Hiroya Minakuchi / Risso's Dolphin (Grampus griseus) surfacing, California

Hiroya Minakuchi / Risso's Dolphin (Grampus griseus) spouting at surface, California

Martin Camm / Carwardine / Illustration of Risso's dolphin (Grampus griseus), Delphinidae (Wildlife Art Company).

Martin Camm / Carwardine / Illustration of Risso's dolphin (Grampus griseus) breach and dive sequence in profile (Wildlife Art Company).

Hiroya Minakuchi / Risso's Dolphin (Grampus griseus) pod, California

Sue Flood / Risso's dolphin breaching (Grampus griseus) California USA

Colin Seddon / Tail fluke of Risso's dolphin at surface {Grampus griseus}, Shetland Islands, UK

Colin Seddon / Risso's dolphins at surface {Grampus griseus}, Shetland Islands, UK

Espen Bergersen / Drone shot of Risso's dolphin (Grampus griseus) pod swimming and surfacing, Andoya, Nordland, Norway, Norwegian Sea. August.

Roland Seitre / Risso's dolphin (Grampus griseus) albino, swimming at ocean surface, Monterey region, California, USA, Pacific Ocean.

Roland Seitre / Risso's dolphin (Grampus griseus) albino, swimming at ocean surface, Monterey region, California, USA, Pacific Ocean.

Roland Seitre / Risso's dolphin (Grampus griseus) head portrait, Monterey region, California, USA, Pacific Ocean.

Roland Seitre / Risso's dolphin (Grampus griseus) albino, swimming at ocean surface, Monterey region, California, USA, Pacific Ocean.

Roland Seitre / Risso's dolphin (Grampus griseus) albino, swimming at ocean surface, Monterey region, California, USA, Pacific Ocean.

Doug Allan / Risso's dolphins (Grampus griseus) breaching, Monterey Bay, California, Pacific Ocean.

Claudio Contreras / Risso's dolphin (Grampus griseus) at sea surface. Loreto Bay National Park, Sea of Cortez, Mexico. May.

Franco Banfi / Risso's dolphin (Grampus griseus) swimming at sea surface. Azores, Atlantic Ocean.

Chase Dekker / Risso's Dolphin (Grampus griseus) jumping, Monterey Bay, California

Chase Dekker / Risso's Dolphin (Grampus griseus) surfacing, California