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Risso's dolphin

A species of Risso's dolphin, Also known as Grampus
Scientific name : Grampus griseus Genus : Risso's dolphin

Risso's dolphin, A species of Risso's dolphin
Also known as:
Grampus
Scientific name: Grampus griseus
Genus: Risso's dolphin
Risso's dolphin (Grampus griseus) Photo By anudibranchmom , used under CC-BY-NC-4.0 /Cropped and compressed from original

Description

Risso's dolphin has a relatively large anterior body and dorsal fin, while the posterior tapers to a relatively narrow tail. The bulbous head has a vertical crease in front. Infants are dorsally grey to brown and ventrally cream-colored, with a white anchor-shaped area between the pectorals and around the mouth. In older calves, the nonwhite areas darken to nearly black, and then lighten (except for the always dark dorsal fin). Linear scars mostly from social interaction eventually cover the bulk of the body; scarring is a common feature in toothed whales, but Risso's dolphin tend to be unusually heavily scarred. Older individuals appear mostly white. Most individuals have two to seven pairs of teeth, all in the lower jaw. Length is typically 10 feet (3.0 m), although specimens may reach 13.12 feet (4.00 m). Like most dolphins, males are typically slightly larger than females. This species weighs 300–500 kilograms (660–1,100 lb), making it the largest species called "dolphin".

General Info

Lifespan

30-50 years

Diet

Risso's dolphin are opportunistic eaters with the primary portion of their diet comprising squid. Their feeding habits also reflect a preference for various species of small to medium-sized fish and shrimps.

Appearance

Risso's dolphin is a large marine mammal with a robust, spindle-shaped body covered in sleek, black or dark grey skin. It commonly features white patches or streaks, predominantly around the throat and belly. Distinguishing features include its prominent, falcate dorsal fin and short, rounded pectoral flippers. Adults typically measure 3-4 meters in length. No significant differences exist in appearance due to age, gender, or subspecies.

Behavior

Risso's dolphin is an aquatic species known for its complex vocal and physical displays during social interactions. It also has an inherent ability for deep-diving for food procurement. This species often gathers in large pods, presenting a strong social structure. Notable for its aggressive behavior, it tends to make distinctive marks on its prey.
Risso's dolphin (Grampus griseus) Risso's dolphin (Grampus griseus) Photo By anudibranchmom , used under CC-BY-NC-4.0 /Cropped and compressed from original
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