Distinguishing characteristics: craggy patches on head called "callosities" used to identify individuals. Lift large, all black tail when diving. Blow readily visible-6 m (20') v-shaped. No dorsal fin. Large lower lips, narrow rostrum, broad throat without throat pleats. Black to mottled grey, white scarring, white belly patches in 30% of individuals.
- North-West Atlantic Ocean species (NWARMS) http://www.marinespecies.org/aphia.php?p=sourcedetails&id=2901