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Both females and males have a characteristic underbite with two pairs of teeth in the lower jaw.

Measuring twice as long as the rest of the fish’s skull, this lower jaw gave Alienacanthus nature’s most extreme underbite, and, perhaps, a stiff lower lip.

“Be Free, You Wrinkly Ghost!” opens, “I’ve never been fully on board with my face” and goes on to detail the surgeries Nancherla has undergone to correct a droopy eyelid and underbite.

Thelma's top beak was crudely clipped just below her nostrils, causing the bottom beak to jut out partially exposed, resembling an underbite.

A small curly-haired thing with an underbite so ugly it was cute.