Risso's dolphin

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Ris·so's dolphin

A marine mammal (Grampus griseus) having a bulbous head, a tall curved dorsal fin, and a gray body with white streaks or scars. Also called grampus.

[After Antoine Risso (1777-1845), French naturalist born in Nice.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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The sea around the Butt of Lewis and down towards Tiumpan Head is recognised as an important area for the lesser-known Risso's dolphin, as well as bottlenose dolphins.
POLLUTION: A Risso's dolphin tangled in fishing line and plastic bags off Sri Lanka.
Mr Wright said it was possible the sighting in the Sound could have been a Risso's dolphin, but added: "We circulated the footage with some knowledgeable experienced cetacean experts who all leaned towards this being an orca.
Little is known about the mysterious Risso's dolphin and its whereabouts around the UK, but this striking species spends the months of late summer into autumn using the waters off our shores.
Single sightings of each of the following cetaceans were also made: short-beaked common dolphin (Delphinus delphis), unidentified common dolphin (Delphinus sp.), and Risso's dolphin (Grampus griseus).
Common name Scientific name Pantropical spotted dolphin Stenella attenuata Striped dolphin Stenella coeruleoalba Spinner dolphin Stenella longirostris Rough-toothed dolphin Steno bredanensis Bottlenose dolphin Tursiops truncatus Risso's dolphin Grampus griseus Fraser's dolphin Lagenodelphis hosei Melon-headed whale Peponocephala electra Pygmy killer whale Feresa attenuata False killer whale1 Pseudorca crassidens Short-finned pilot whale Globicephala macrorhynchus Killer whale Orcinus orca Sperm whale Physeter macrocephalus Dwarf sperm whale Kogia sima Unidentified Kogia Kogia sima/breviceps Blainville's beaked whale Mesoplodon densirostris Cuvier's beaked whale Ziphius cavirostris Longman's beaked whale Indopacetus pacificus Unidentified Mesoplodon Mesoplodon spp.
The albino Risso's dolphin was driven into a cove over the weekend by fishermen at Taiji in Japan, said Sea Shepherd, which has teams of observers in the remote town.
In The Cetacean Life, Liao describes that in his quest for the cetaceans with his research team, he has surprisingly discovered eight kinds of cetacean animals near the eastern part of Taiwan: False Killer Whale, Beaked Whales, Spotted Dolphin, Spinner Dolphin, Fraser's Dolphin, Bottlenose Dolphin, Killer Whale, and Risso's Dolphin. This news truly changed people's opinions because the people of Taiwan have generally believed that the cetacean animals seldom swim close to Taiwan.
We interpreted Risso's Dolphin behavior as aggressive when they swam among, rapidly and directly toward (charged), bumped into, and breached near the heads of (only) adult Sperm Whales (which we recorded 12 times), followed by fast retreats (Table 1).
In August a Risso's dolphin was spotted on the sand at Elly Bay in north Mayo.
There are few records of Risso's dolphin in the southern North Sea but a group of three dolphins seen on September 14 were identified as Risso's.