description Risso's Dolphin (Grampus griseus) Overview
Risso’s dolphin, *Grampus griseus*, is a deep-water dolphin distinguished by its slate grey skin and extensive scarring. This unique species primarily consumes squid and is notable for its solitary behavior and frequent dives to considerable depths. It's most commonly observed in temperate and subarctic waters around the globe and is of interest to marine biologists studying deep-sea adaptations and cetacean distribution.
insights Ranking position
Risso's Dolphin (Grampus griseus) ranks #47 of 261 in the Dolphin ranking, behind Maui's Dolphin (Cephalorhynchus hectori maui), ahead of Springer.
help Risso's Dolphin (Grampus griseus) FAQ
Why do Risso's dolphins have so many scars?
Risso's dolphins accumulate extensive white scarring throughout their lives from teeth rake marks inflicted by other Risso's dolphins during social interactions and from encounters with squid. Older individuals can appear almost entirely white because the slate-grey skin becomes covered in overlapping scars.
Where are Risso's dolphins typically found?
Risso's dolphins inhabit temperate and tropical waters worldwide, preferring deeper offshore areas rather than coastal shallows. They are commonly observed in locations such as Monterey Bay in California, the Azores, and the Mediterranean Sea.
What do Risso's dolphins eat?
Risso's dolphins primarily feed on squid, which they hunt during deep dives, often at night when squid migrate closer to the surface. Their specialized diet shapes their blunt, headless-looking profile, as they lack the beak typical of many other dolphin species.
How deep can Risso's dolphins dive?
Risso's dolphins are among the deeper-diving dolphin species, regularly descending to several hundred meters and capable of dives lasting up to roughly 30 minutes. These deep dives support their squid-hunting foraging strategy in mesopelagic waters.
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