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Risso's Dolphin (Grampus griseus)Risso's Dolphins off Pt. Vicente, Southern California Photograph by Cybele May. Some rights reserved. (view image details) Risso's Dolphins off Pt. Vicente, Southern California Photograph by Cybele May. Some rights reserved. (view image details) Photographed on boat trip from Avila Beach, California. Photograph by Mike Baird. Some rights reserved. (view image details)
RISSO'S DOLPHIN FACTS
DescriptionRisso's Dolphin is pale gray with a blunt bulbous head and large dorsal fin. Adults are covered with pale scratches and scars. Juveniles are darker and have no scarring. The flippers are long and pointed. There is a groove from the tip of the snout to the blowhole. The blowhole is quite large and slightly to the left of the midline. The eye is small and often surrounded by a dark grey or black patch. Risso's Dolphin has no teeth in the upper jaw and an average of 3 or 4 on each lower jaw. Size length: 4m - 4.3m. Weight: 300kg. Environment Risso's Dolphins are found in the open ocean, usually on the seaward side of the continental slope. Food octopus, squid, cuttlefish, krill Breeding Little is known of their breeding, Calves are about 1.1m - 1.5m at birth. The gestation period is about 12-13 months. Range All temperate and tropical oceans Conservation Status The conservation status in the 2004 IUCN Red List of Threatened Animals is "data deficient". Classification
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