Omura's whale is a slender baleen whale. A study off northwestern Madagascar recorded asymmetric jaw coloration and loose groupings of mostly unassociated individuals.
It has a long, slender body typical of a rorqual. The Madagascar description reports a white right lower jaw and dark left lower jaw, with an asymmetric pale marking ahead of the dorsal fin.
A study off northwestern Madagascar recorded mostly solitary, loosely aggregated whales. Lunge feeding was observed, and the prey was suggested to be zooplankton.
An extinction-risk assessment has not been added yet.