breeding adult; white facial lines; orange bill (California, USA; 2009-03-08)

Rhinoceros Auklet
Cerorhinca monocerata

Native Range: North America and Eurasia

Notes: a dark alcid that forages at sea but nests in burrows or rock crevices; gets its name from adult's whitish horn-like protuberance from the base of the upper bill during the breeding season.

nonbreeding adult; note bill shape and "horn" (California, USA; 2009-03-08)