Is colored blue/gray on the the back and the sides. The ventral region is light gray. The dorsal fin is typically slightly hooked and the beak is well defined and of moderate length.
Known to be very active; breach often, show somersaults, spy-hopping and tail-splashing. They are unlikely to approach boats.
Close to estuaries, inlets and other protected shallow-water areas around the eastern and northern South American coast; reported as far south as southern Brazil and north as far as Nicaragua
They migrate up to 130 km upriver. The movement patterns vary among cold and warm seasons in temperate regions.
Social system/Group size
The groups size varies according to time of the day and activity; usually seen with 2 - 10, but nursery groups are twice as large as others.
Entanglement in fishing gear, building of dams, overfishing and pollution are the biggest threats.
It is also known as the Guyana dolphin.