Rhinoceros Auklet

Cerorhinca monocerata

Order

CHARADRIIFORMES

Family

Auks, Murres and Puffins (Alcidae)

Code 4

RHAU

Code 6

CERMON

ITIS

Egg Color:

White with brown, gray or lavender spots



Number of Eggs:

1



Incubation Days:

39 - 52



Egg Incubator:

Both sexes



Nest Location:

At end of old or new burrow 8 - 20 feet deep.



Nest Material:

Twigs, moss, and ferns.



Migration:

Nonmigratory



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General

Rhinoceros Auklet: Medium-sized seabird with black upperparts, dark gray underparts, and white belly. Eyes have long white plumes above and below. Bill is yellow with pale horn. Sexes are similar. Winter adult is duller and lacks bill horn and eye plumes.

Range and Habitat

Rhinoceros Auklet: Breeds from California, the Channel Islands, to the Aleutian Islands in Alaska in North America; and Hokkaido and Honshu, Japan, as well as North Korea and Sakhalin Island in Asia. It winters both in offshore and inshore waters, exhibiting some migration. Their habitat include burrows dug into the soil, or natural caves and cavities between 1 and 5 m deep.

Breeding and Nesting

Rhinoceros Auklet: One white egg, often spotted, is laid in a burrow; nests in colonies, sometimes in large numbers. Incubation ranges from 39 to 52 days and is carried out by both parents.

Foraging and Feeding

Rhinoceros Auklet: Feeds mainly on small fish, but sometimes takes crustaceans and squid; forages by diving from the surface and pursuing prey under water.

Vocalization

Rhinoceros Auklet: Gives low growling notes on the nest.

Similar Species

Rhinoceros Auklet: In basic plumage, the smaller Cassin's Auklet, the whiter-bellied Parakeet Auklet, and larger-billed Tufted Puffin are all similar because they share the darker plumage.

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UnderpartsX

Belly, undertail coverts, chest, flanks, and foreneck.

UpperpartsX
Back, rump, hindneck, wings, and crown.
BellyX
The ventral part of the bird, or the area between the flanks on each side and the crissum and breast. Flight muscles are located between the belly and the breast.
PlumesX
Large, conspicuous, showy feathers.
Parts of a Standing bird X
Head Feathers and Markings X
Parts of a Flying bird X