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).

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

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.

Franco Banfi / Risso's dolphin (Grampus griseus), Pelagos Sanctuary for Mediterranean Marine Mammals, France, Mediterranean Sea. June

Franco Banfi / Risso's dolphin (Grampus griseus), Pelagos Sanctuary for Mediterranean Marine Mammals, France, Mediterranean Sea. May

Sergio Hanquet / Risso's dolphin (Grampus griseus) at surface, Fuerteventura, Canary Islands.

Sergio Hanquet / Risso's dolphin (Grampus griseus) at surface, Fuerteventura, Canary Islands.

Sergio Hanquet / Risso's dolphin (Grampus griseus) at surface, Fuerteventura, Canary Islands.

Sergio Hanquet / Risso's dolphin (Grampus griseus) at surface, Punta de La Rasca, Tenerife, Canary Islands.