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.]
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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.
A Risso's dolphin takes a leap out of the water in Pembrookshire and inset below, one off the coast of Anglesey
Among the species stranded in the region's beaches were giant sperm whale, spinner dolphin, Fraser's dolphin, striped dolphin, common bottlenose dolphin, pygmy killer whale, Risso's dolphin and dwarf sperm whale.
Also found were Grampus griseus, commonly called Risso's dolphin after Antoine Risso, who first described the mammal in detail.
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.
Alternatively, in the dusky dolphin (Lagenorhynchus obscurus), the fusion of the frontal-supraoccipital suture is a reliable indicator of sexual maturity (Van Waerebeek, 1993), whereas in the Risso's dolphin (Grampus griseus) closing of fronto-interparietal, nasal-frontal and maxillary-premaxillary sutures are reliable indicators of sexual maturity (Chen et al.
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.
Liao has described clearly the characteristics of each different cetacean lifestyle: for example, he writes that Risso's Dolphin bears certain white scars or bruises on their skin due to power struggles of survivorship with other ocean creatures.
On 7 occasions, a Risso's Dolphin was seen rapidly approaching (and once in contact with) an adult Sperm Whale, then quickly retreating; on 4 of these 7 occasions, the adult Sperm Whale was seen (and photographed or video recorded) opening its mouth exposing its white lower jaw coloration (Fig.
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.