Commerson's dolphin

Scientific Name: Cephalorhynchus commersonii
Other Names: Piebald Dolphin, Skunk Dolphin, Jacobite
Length: 4.3-5.8 ft. (1.3-1.7 m.)
Weight: 75-130 lbs. (35-60 kg.)
Teeth: 106-140

This is a small species, first named in 1804. The commerson's dolphin is actually very similar to a porpoise.  The forehead or melon is small so the shape of the head is flat. It reaches about 1.2 m. in length and rarely exceeds 45 kg. body weight. The beak is not distinguished from the forehead. The fin, placed slightly posterior to the mid point of the back, has a long base, and is low with a rounded tip. The color patterns are distinctive, clearly delineated patches of black and white. One black patch includes the head and both jaws and runs back to include the flipper, leaving a
white throat. The second includes the posterior and the flukes and runs forward dorsally to include the dorsal fin. A small black patch also covers the genital opening and the anus. Male and female dolphins have different black patches on their undersides. The patches of males are shaped like raindrops and the patches on females are shaped like horseshoes.

Virtually nothing is known of the behavior or reproductive patterns of this species. It appears to form very small social groups. It seems to prefer inshore waters off the coast of the southern tip of South America, in the Strait of Magellan, Falkland Islands and Tierra del Fuego. Calves are born all gray, black, and brown, however, they develop adult markings as they mature.