Risso's Dolphins:
Description
Risso's Dolphins Grampus griseus are medium to large-sized marine mammals, growing up to 10 feet (3 meters) in length and weighing between 300 to 500 kg (660 to 1100 lbs). They have a distinctive appearance with a bulbous headand a prominent, tall dorsal fin that can sometimes be mistaken for a killer whale from a distance. Their bodies are typically grey to brownish-grey, but as they age, they become paler due to extensive scarring from interactions with other dolphins, parasites, or squid bites.
Taxonomy and Related Species
Risso's dolphins belong to the family Delphinidae and are the only species in the genus Grampus. They are closely related to pilot whales (Globicephala spp.), Pygmy Killer Whales Feresa attenuata, Melon-headed Whales Peponocephala electra, and False Killer Whales Pseudorca crassidens.
Distribution
These dolphins are found in temperate and tropical waters around the world, typically inhabiting areas along continental shelves. Their range extends from the Gulf of Alaska to Southern Greenland in the north and Tierra del Fuego in the south. They are also present in the Indian, Atlantic, and Pacific Oceans, as well as the Persian Gulf, Mediterranean, and Red Sea.
Diet
Risso's Dolphins primarily feed on cephalopods (such as squid), but their diet also includes prawns, shrimp, and cuttlefish. They are capable of diving to depths of up to 600 meters to hunt their prey.
Where to See Them in the UK
In the UK, Risso's dolphins can be spotted in several locations:
Hebrides
Shetland Isles
Orkney
Irish Sea (particularly off the coasts of County Wexford and Pembrokeshire)
Northwest Wales and the Isle of Man
Best Places to See Them in Wales
For the best chances of seeing Risso's Dolphins in Wales, head to the Llyn Peninsula and Bardsey Island or Pembrokeshire coast, especially around the St. David's Peninsula and Cardigan Bay. The are all excellent locations known for regular sightings of these fascinating creatures.
I hope this helps! Have you ever had the chance to see a Risso's dolphin in the wild?
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