What physical feature distinguishes mature Humphead Wrasse males and aids in their identification?

Answer

A prominent, fleshy hump developing on their forehead

The Humphead Wrasse, or Napoleon Wrasse, possesses several distinctive characteristics, especially in mature males. The most recognizable feature is the development of a significant and noticeable fleshy protuberance situated on the top of the forehead. This feature is responsible for lending the fish its common English name, Humphead Wrasse. Furthermore, these males also develop intricate facial markings that visually resemble traditional Māori tā moko tattoos, assisting in identification alongside the hump.

What physical feature distinguishes mature Humphead Wrasse males and aids in their identification?
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