Right whales are 40 to 50 feet long with a large head that can be one-third the length of the body. Their skin is generally all black, though some have white patterns on their bellies and frequently bear white scars from entanglements in fishing gear. They have distinctive white or yellowish callosity patches on their heads.

Right whales are easily distinguished from other whales by several features:

Right whale illustrations with distinguishing features

Illustration Daniela Weil, http://www.simpledifference.com/.