Risso's dolphin is named after Antoine Risso, whose description formed the basis of the first public description of the animal. Another common name for the Risso's dolphin is grampus, although this common name was more often used for the orca. Length is typically 10 feet (3.0 m), although specimens may reach 14.1 feet (4.3 m). Males are typically slightly larger than females. This species weighs 300-500 kilograms (660-1,100 lb), making it the largest species called "dolphin". Linear scars mostly from social interaction eventually cover the bulk of the body.