"This grey dolphin has a large rounded head. As it grows older, its skin gradually becomes white. It has no teeth in its upper jaw, and sometimes no teeth at all.
It swims the seas leisurely in groups of up to several dozen.
Adults look white because of countless scars on their skin. All dolphins and whales are injured at some point, but their scars usually fade with time.
This species' injuries leave permanent white scars which gradually turn their entire body white as they get older."
These dolphins can be found swimming in a close-knit but small pod at very deep depths. They like the sound of the Sea Whistle.
- These dolphins were named after the scientist who first formed a comprehensive description of it, Antoine Risso.
- This dolphin is the only species in its genus, grampus.
- Among Taiwanese fishermen, this dolphin is commonly known as the Monk Dolphin.