Stejneger's Petrel

Pterodroma longirostris

Order

PROCELLARIIFORMES

Family

Petrels and Shearwaters (Procellariidae)

Code 4

STPE

Code 6

PTELON

ITIS

Egg Color:

White



Number of Eggs:

1



Incubation Days:

51 - 54



Egg Incubator:

Both sexes



Nest Location:

In burrow or rock crevices.



Nest Material:

No material added to nest.



Migration:

Migratory



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General

Stejneger's Petrel: Small petrel with gray-brown upperparts, dark gray rump and white underparts. Head and nape are black. Face is white and bill is black. Upperwing is deep gray-brown with black greater coverts and outer primaries forming an M pattern linked across lower back. Legs and feet are blue-gray. Tail is dark gray-brown mottled with white. Sexes are similar. Juvenile is similar to adult, but the mantle and scapular feathers have narrow pale gray fringes which look slightly scaly; has grayer upperparts.

Range and Habitat

Stejneger's Petrel: This species is an endemic breeder at Alejandro Selkirk Island in the Juan Fernandez archipelago off the coast of California. It is found in the Pacific Ocean from Juan Fernandez archipelago to southern California and east of Japan. This species is pelagic, only coming ashore to breed.

Breeding and Nesting

Stejneger's Petrel: One white egg is laid in a burrow or rock crevice. Incubation ranges from 51 to 54 days and is carried out by both parents.

Foraging and Feeding

Stejneger's Petrel: They feed on squid and fish in pelagic waters. They usually forage in flight by skimming but sometimes plunge dive. These petrels have a special digestive system consisting of an upper and lower stomach. Their diet produces a calorie-rich oil that is stored in the upper stomach and then trickles into the lower stomach to be absorbed. This acts as a constant source of energy.

Vocalization

Stejneger's Petrel: Silent at sea.

Similar Species

Stejneger's Petrel: Cook's Petrel has paler crown and nape, and no contrast between crown and neck.

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UnderpartsX

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

UpperpartsX
Back, rump, hindneck, wings, and crown.
FaceX
The front part of the head consisting of the bill, eyes, cheeks and chin.
MantleX
The upper surface of the back and wings covered with shorter feathers.
NapeX
Also called the hindneck or collar, it is the back of the neck where the head joins the body.
Outer primariesX
The outer primaries are the primary feathers on the wing farthest from the body. They often appear to be the longest feathers on the wing.
PrimariesX
The primaries are the flight feathers specialized for flight. They are attached to the "hand" equivalent part of the wing.
RumpX
The area between the uppertail coverts and the back of the bird.
PelagicX
The pelagic is a type of bird whose habitat is on the open ocean rather than in a coastal region or on inland bodies of water (lakes, rivers). An example of a pelagic bird is the blacklegged kittiwake.
Parts of a Standing bird X
Head Feathers and Markings X
Parts of a Flying bird X