Risso’s dolphins are predominantly deep water lovers and are therefore relatively unstudied, however in several places around the world they can be found within only metres of the coast enabling researchers to learn so much more about them. Understanding the Risso's dolphin's scars. large, dark grey dorsal fin, resembling that of a female killer whale; Blow. Size. Status: Common. Risso’s dolphins (Grampus griseus) are relatively large dolphins measuring up to 4m in length.
Sometimes called 'gray dolphins', the Risso's dolphin enjoys deep offshore waters. small and bushy; Surface behaviour. Risso's dolphin has a relatively large anterior body and dorsal fin, while the posterior tapers to a relatively narrow tail. Life span: 30 years. Maturity: Unknown. Risso’s dolphins have a distinctive grey body which over time becomes covered in scars. to a maximum of 4 m; Colour. Like most dolphins, males are typically slightly larger than females. may porpoise, spyhop or breach The bulbous head has a … mostly grey, with white on the belly; dorsal and pectoral fins are dark grey; body is usually covered with many scars and scratches; older animals may appear completely white; Dorsal fin. Risso’s dolphin reaches sexual maturity between the ages of 8 – 12 with females typically maturing 2 years before their male counterparts. Weight averages about 650 pounds (300 kilograms) and large individuals may weigh up to 1100 pounds (500 kilograms). Size: 3.2 m; Diet: Squid, octopus and cuttlefish; DESCRIPTION: A large bulky dolphin with a bulbous head, no beak, a tall curved dorsal fin and elongated flippers. Words and photographs by Stefano Bellomo. Size comparison of an average human and a Risso's dolphin (Grampus griseus). Breeding: Single young born once a year. We would like to show you a description here but the site won’t allow us. The scratches on their bodies are believed to be a result of rough behaviour including fighting and catching prey. Risso’s Dolphin is named after Antoine Risso – a biologist and zoologist, born in 1777 in modern-day France, who also has a species of lanternfish, algae and snail named after him. Size: 3.6 - 4 m (11.75 - 13 ft); 400 - 450 kg (880 - 990 lb). Risso's dolphins have a cosmopolitan distribution, meaning they can be found worldwide in temperate, subtropical, and tropical oceans and seas from latitudes 64° north to 46° south. Description: Size comparison of an average human and a Risso's dolphin (Grampus griseus).Date: 27 May 2007: Source: Own work: Author: Chris_huh: Permission (Reusing this file)GNU Free Documentation License Words and photographs by Stefano Bellomo. Risso’s dolphins are mysterious creatures usually only found in deep, offshore waters. The bulbous head has a vertical crease in front. Risso’s dolphin is one of the most mysterious cetacean species as little is know about its life cycle and much of its behaviour and habits remains unknown. Their preferred habitats appear to be mid-temperate waters of the continental shelf and slope between 30° and 45° latitude.
Most distinctive is the blunt head without beak and dark coloration dominated by whitish scars which they accumulate throughout life, making older animals appear almost white. I was sitting on the bow of our research vessel when they started to swim closer to me, soaring through the waves below. Group size / social behaviour social, usually in groups of 10 – 50 animals. Risso’s Dolphins length is typically 10 feet (3 metres), although some have been recorded to measure up to 12.5 feet (3.8 metres). Rissos Dolphin. It is estimated that the average lifespan for these dolphins range from 20 – 30 years with some dolphins reaching nearly 35 years of age. Most sightings of Risso’s dolphins in BC are of groups with less than 25 animals.


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