Risso's dolphin
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Risso's dolphin is a dolphin, the only species of the genus Grampus. Some of the closest related species to these dolphins include: pilot whales, pygmy killer whales, melon-headed whales, and false killer whales.
Risso's dolphin
Illustrations by Edward Drinker Cope in 1876
A calf bears no scars, in contrast to its mother behind it.
The scar patterns are so pronounced and persistent in this species that they can be used to distinguish individuals over a lifetime.
Dolphin
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A dolphin is an aquatic mammal within the infraorder Cetacea. Dolphin species belong to the families Delphinidae, Platanistidae, Iniidae, Pontoporiidae, and possibly extinct Lipotidae. There are 40 extant species named as dolphins.
A common bottlenose dolphin (Tursiops truncatus)
The face of a common bottlenose dolphin
A pod of Indo-Pacific bottlenose dolphins in the Red Sea
Dolphins surfing at Snapper Rocks, Queensland, Australia