Beaked Whale Identification Guide
In Hyperoodon the maxillary ridges or "crests" are extremely elevated. Differences in the height and anterior - posterior extension of the crests can be used to distinguish the two species.

Lateral View of
Maxillary Crest

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The maxillary crest extends posterior to the external nares and become confluent with the occipital crests.
The maxillary crest does not extend posterior to the external nares.
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