Grampus griseus (G. Cuvier, 1812)
Risso's dolphin
Species recognized by The Integrated Taxonomic Information System
, T Orrell (custodian) in 
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Overview
Biology
Source and Additional Information
Risso's dolphin feeds largely on squid, although other cephalopods are also taken, as well as fish and crustaceans (2). Like most dolphins, this species is a highly social animal, typically occurring in groups of between 3 to 50 individuals (2), and may mix with different species of cetaceans (whales and dolphins) (8). When groups are hunting they spread out into a long line (5). This species tends to ride alongside or in the wake of boats, and young individuals often breach (clear the water), slap their flippers on the surface of the water or 'spyhop' (lift their heads clear of the water) (5). A number of sounds are produced, including characteristic 'signature whistles' (6), many of these vocalisations are important in detecting prey through echolocation (8).
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"Grampus griseus (G. Cuvier, 1812)". Encyclopedia of Life, available from "http://www.eol.org/pages/328529". Accessed
22 Mar 2010.
