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Larus thayeri

THE RACE ROCKS TAXONOMY
Domain Eukarya
Kingdom Animalia
Phylum Chordata
Class Aves
Order Charadriliformes
Family Laridae
Genus Larus
Species thayeri
Common Name: Thayer's Gull
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thayers wind movie
The version of the video made for lower bandwidth, 56k.
Thayer's Gulls aligned for wind, November, 2005
larusts.jpg thayergroups.jpg thayers.jpg
In October of 2005, a large population of Thayer's Gulls has settled in to overwinter at Race Rocks. This scene is on the South West corner, just outside the Marine Science Centre at Race Rocks.

G.Fletcher photos
thayer It is difficult determining immature gulls . This one appeared when other Thayer's were predominant on the island.( PB photo)

History:

Formerly considered as a subspecies of Herring Gulls.

It is sometimes regarded as a subspecies of Iceland Gulls.

Physical Appearance:

221/2" - 25" wide

Mantle slightly darker grey

Grey on the underside of the wing tips is distinctive.

Yellow bill with red spot on lower mandible.

Pale to brown eyes, with a purple-red ring around it.

Darker pink legs.

Sound:

Long mewing call: hiyah

Warning call: gah-gah-gah

Nesting:

Usually 2 or 3 olive-brown, heavily blotched eggs in grass nest on sea cliffs in the high arctic. They only overwinter at Race Rocks, feeding on the small herring and krill in the surrounding waters.

Habitat:

They are seabirds of the arctic, coastal rocks and rocky headlands.

They are usually located on the Pacific coast on North America during winters.

At Race Rocks, they often number in the hundreds out on the South West corner of the larger island, as the numbers below show.

Christmas Bird Counts 1997 1998 1999 2000 2001 2002 2004
(THGU) 390 213 48 220 530 2000 450

Immature Gulls:

They are similar to herring gulls, but slightly smaller and with proportionately smaller bill.

Back to
The Race Rocks Taxonomy
This file is provided as part of a collaborative effort by the students of Lester B. Pearson College
Date:
20 Oct 2003
Kevin Mingyui Chau
Copyright
Lester B. Pearson College