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OverviewAI-generated
The Risso's Dolphin, scientifically named *Grampus griseus*, is a marine mammal species within the family Delphinidae. It belongs to the order Cetartiodactyla, class Mammalia, and phylum Chordata. The species was described by G. Cuvier in 1812 and is named after Antoine Risso. Common names for this dolphin include calderón gris, Delfín de Risso, Fabo Calderón, Dauphin de Risso, and gray grampus.
The taxon is currently classified as Least Concern on the IUCN Red List, a status recorded in 2025. Its accepted range includes Brazil and Soure. In captivity, the maximum longevity for this species is 42.5 years, based on observations of a single specimen.
Synthesized by Vinony from 25 facts across 5 sources: Wikidata, IUCN Red List, WoRMS, Encyclopedia of Life, Vinony graph. Generated from structured data (not the Wikipedia text) and checked against those facts — may still contain errors.
Species
Least Concerngray grampus
Species
- PhylumChordata
- ClassMammalia
- OrderCetartiodactyla
- FamilyDelphinidae
Maximum longevity: 42.5 years (captivity) Observations: One captive specimen lived for 42.5 years (Richard Weigl 2005).
via IUCN
~14 min read
Encyclopedic overview
Risso's dolphin (Grampus griseus) is the only species of the genus Grampus in the family Delphinidae (dolphins). Some of the most closely related species to these dolphins include: pilot whales (Globicephala spp.), pygmy killer whales (Feresa attenuata), melon-headed whales (Peponocephala electra), and false killer whales (Pseudorca crassidens). These dolphins grow to be about 10 ft in length and can be identified by heavy scarring that appears white. They are located worldwide in cold to temperate waters, but most typically found along continental shelves due to their eating habits. Risso's dolphins have a diet that contains primarily cephalopods. They are able to search for prey at various depths due to their ability to reach depths of almost 600 m (2,000 ft). Individuals typically travel in pods ranging from 10 to 50 dolphins, with which they form tight social bonds.
Like most marine species, Risso's dolphins suffer from anthropogenic disruptions to the environment. Pollution, both from noise and plastics, is a common cause of higher mortality rates. Many can be, or have been, affected by entanglement in fishing nets and whaling. Risso's dolphins are currently protected in the United States, but they are still hunted in other parts of the world.
Excerpted from Wikipedia’s “Risso's Dolphin” article, available under the CC BY-SA 4.0 licence.