G. Dorsal fin. Rorqual whales and the pygmy right whale have a fin on top of the back called a dorsal fin. Humpback whales have a small dorsal fin located on a hump. The shape of the dorsal fin varies among the humpback whales. Right, bowhead, and gray whales have no dorsal fin.
Gray whales have a dorsal hump followed by a series of bumps.
Like the flukes, the dorsal fin is made of dense, fibrous connective tissue, with no bones. Dorsal fins are often scarred or marked. Photos of baleen whale dorsal fins can be used for photo-identification. Their narrow elongated upper jaw bones arch upwards to house extremely long baleen. The lower jawline is deeply curved upwards in profile.