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Rhinoceros Auklet
Cerorhinca monocerata





credit: Tokumi


ADULT SUMMER Has gray-brown upperparts, darkest on crown, nape, back, and wings; neck and chest are also gray-brown, but underparts are otherwise whitish. Has shaggy white plumes running back from eye and from base of bill. Bill is orange-yellow, relatively large (like a scaled-down puffin bill) and with a forward-projecting, pale hornlike plate after which species is named. Iris is white. ADULT WINTER Similar, but white plumes are much-reduced and bill is smaller, duller, and lacks the projecting "horn." JUVENILE Similar to winter adult, but bill is smaller and duller still, and iris is darker.

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