It is genetically closest to the mallard group,[2] but shows some peculiarities in its behavior[3] and (as far as they can be discerned) plumage; it is accordingly placed in the subgenus Melananas pending further research.

[5] Though it likes to stay in rivers and streams during the day it prefers large open waters during the night.

Also the African black duck makes its cup shaped nest of driftwood and matted grass.

Though it builds its nest near water it is always above flood level and on the ground.

[5] It is an omnivore that feeds off of larvae and pupae usually found under rocks, aquatic animals, plant material, seeds, small fish, snails, and crabs.