Rhinoceros Auklet Identification

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Adult Description

Medium-sized, stocky waterbird. All dark gray, except for white belly. Breeding adult has vertical white projection at base of orange bill, and two thin white plumes on face.

Immature Description

Similar to non-breeding adult, with dusky bill and a reduced "horn."
Relative Size

Relative Sizebetween robin and crowbetween robin and crow
Measurements
  • Both Sexes
    • Length: 11.0-11.4 in (28-29 cm)
    • Weight: 12.3-21.9 oz (350-620 g)
    • Wingspan: 23.2-24.4 in (59-62 cm)