The melon may bulge slightly or not at all in front of the blowhole and slopes smoothly to the long and pointed beak. The mouthline is relatively straight.
Adult males are darkly pigmented over entire body except for the rostrum and lower jaw which are white. Females are dark gray on the dorsal surface and light gray on the ventral surface, with patches of white around the umbilical scar, genital and anal slit and mammary slits. The lower jaw and upper lips are light gray. The flippers are darker than the surrounding body.
Adult body length ranges between 5.3 to 5.8 m. Recorded maximum body length for adult males and females is 5.6 m and 5.8 m, respectively. Length at birth is 2.4 m.
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