They have a round head and are colored dark gray to black. They have smooth skin and flippers as forelimbs.
Amazon river system
Do not migrate.
Social system/Group size
They are usually seen solitary or in mother/calf pairs, but might assemble to groups of 4 - 8 individuals during the dry season.
Habitat degradation, hunting and entanglement in fishing gear.
They do not eat anything during the dry season.