Head Shape
The medium length beak distinct is distinct from the bulbous forehead in both sexes, though
adult males have a larger head with a more pronounced melon. As males mature the large forehead surface becomes flattened
like the end of a barrel and overhangs the beak. The mouthline is weakly sinusoidal.
Coloration
Two main types of dorsal body pigmentation exist in adults. Most common dorsal coloration
in adult H. planifrons is brownish to yellowish, though bluish gray or bluish black color morphs exist.
Head and ventral regions may be paler. In juveniles the light nuchal band can either be prominent or muted,
and may fade with age. Eye patches may be pronounced or almost absent. The dorsal aspect of the flippers may be
whitish or dark.
Size
Length of adult animals ranges between 6 - 8 m. Recorded maximum body length for adult male
and female individuals is 6.9 m and 7.5 m, respectively. Mean body length at birth is unknown.
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