Crested auklets are known for their forehead crests, which are made of black forward-curving feathers. These forehead crests are highly variable and can have between two and twenty-three narrow forward curving feathers. The average auklet has 12 crest feathers, which are of variable length, between 8.1 and 58.5 millimetres. Auklets have auricular plumes and a bright orange bill with curved accessory plates. Like forehead crests, these features vary widely within auklet populations.

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