They are dark grey in color with an underside in a lighter grey, sometimes whitish or with a shimmer of pink. They have a shallow indentation at the blowholes in front of their eyes. The dorsal fin is triangular, points backward and is located further back than in any other porpoise or dolphin.
They appear to be shy. They show only little of their bodies when surfacing and move quickly away from boats.
Coastal waters from northern Peru (Pacific) up to southern Brazil (Atlantic), staying close to the shore.
Do not migrate.
Social system/Group size
Usually seen solitary or in pairs, but occasionally larger groups gather in rich feeding areas.
Entanglement in fishing gear is the biggest threat, although disturbance by humans is also known to cause stress.
Shortly after death the bodies turn completely black.