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Swallow-tailed Gull

From Opus

(Difference between revisions)
Revision as of 10:16, 25 April 2007 (edit)
Articuno (Talk | contribs)
(Description)
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Revision as of 10:18, 25 April 2007 (edit) (undo)
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Line 9: Line 9:
==Food== ==Food==
-Feeds almost entirely on squid.<br>+Feeds almost entirely on squid and clupeoid fish.<br>
 + 
==Call== ==Call==
Unique clicking sounds, possibly developing for echo location, some typical gull-like cries.<br> Unique clicking sounds, possibly developing for echo location, some typical gull-like cries.<br>
==Identification== ==Identification==
Sexes are alike. Adult in breeding plumage has dark, grey head and neck, red orbital ring, black bill tipped with pale grey. Grey mantle and large white wing patches. The legs are pink to red in colour. Adult non-breeding looses the dark head. Juvenile is white and mottled with brown, dark eye patch and orbital ring. No white on bill and paler legs.<br> Sexes are alike. Adult in breeding plumage has dark, grey head and neck, red orbital ring, black bill tipped with pale grey. Grey mantle and large white wing patches. The legs are pink to red in colour. Adult non-breeding looses the dark head. Juvenile is white and mottled with brown, dark eye patch and orbital ring. No white on bill and paler legs.<br>

Revision as of 10:18, 25 April 2007

Creagrus furcatus
Photo by Juninho
Photo by Juninho

Contents

Description

Once known as Larus furcatus - The only nocturnal gull, a pelagic species that can be found in the Galapagos Islands and the coasts of Equador and Peru.Closely related to Sabine's Gull.
In 1964, Jack P. Hailman found that the birds have reflective eyes similar to those of nocturnal mammals.

Breeding

Breeds all year round and lays single egg clutches and raises a single chick brood. Performs mutual preening and head tossing behaviour.

Food

Feeds almost entirely on squid and clupeoid fish.

Call

Unique clicking sounds, possibly developing for echo location, some typical gull-like cries.

Identification

Sexes are alike. Adult in breeding plumage has dark, grey head and neck, red orbital ring, black bill tipped with pale grey. Grey mantle and large white wing patches. The legs are pink to red in colour. Adult non-breeding looses the dark head. Juvenile is white and mottled with brown, dark eye patch and orbital ring. No white on bill and paler legs.

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