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Heermann's Gull

From Opus

(Difference between revisions)
Revision as of 00:58, 23 December 2016 (edit)
Deliatodd-18346 (Talk | contribs)
(Imp sizes. Pictures of 1st winter and flight. References updated)
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Deliatodd-18346 (Talk | contribs)
(References updated)
 
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==References== ==References==
-#{{Ref-Clements6thAug16}}#BirdLife International (2008) Species factsheet: ''Larus heermanni''. Downloaded from [http://www.birdlife.org/datazone/search/species_search.html?action=SpcHTMDetails.asp&sid=3213&m=0 http://www.birdlife.org] on 12/9/2008.+#{{Ref-Clements6thAug17}}#BirdLife International (2008) Species factsheet: ''Larus heermanni''. Downloaded from [http://www.birdlife.org/datazone/search/species_search.html?action=SpcHTMDetails.asp&sid=3213&m=0 http://www.birdlife.org] on 12/9/2008.
#Handbook of the Birds of the World Alive (retrieved December 2016) #Handbook of the Birds of the World Alive (retrieved December 2016)
{{ref}} {{ref}}

Current revision

Photo by richard bledsoeSan Diego coast, California, USA, January 2004
Photo by richard bledsoe
San Diego coast, California, USA, January 2004
Larus heermanni

Contents

[edit] Identification

43–49 cm (17-19ΒΌ in); a medium-sized gull

  • Gray body
  • Blackish-grey wings and tail with white edges
  • Red bill with black tip
  • White head during breeding
    • Gray head during non-breeding

[edit] Immature

Resembles non-breeding adults but are darker and browner, and the bill is flesh-colored or pink until the second winter.

1st WinterPhoto by Brian HubbsMonterey, California, December 2016
1st Winter
Photo by Brian Hubbs
Monterey, California, December 2016

[edit] Distribution

The west coast of North America. Breeds only on islands off the west coast of Mexico, but a common non-breeding visitor to the west coast of California in the United States, and in smaller numbers north through Oregon and Washington to British Columbia in Canada.

Vagrant in Alaska and Guatemala.

[edit] Taxonomy

This is a monotypic species[1]..

[edit] Habitat

Shores or well out to sea, rarely inland, but occurs regularly at Salton Sea in California.

[edit] Status

Photo by GentooSan Diego, California, December 2007
Photo by Gentoo
San Diego, California, December 2007

Classified as Near Threatened in the 2008 IUCN Red List.2 The breeding range is severely restricted; 90% of the population breeds on a single Mexican island, Isla Rasa.

[edit] Behavior

[edit] Breeding

Nests colonially on the ground, like many gulls. It lays two or three eggs, grayish buff to buff with gray and brown markings.

[edit] Diet

Feeds on a wide range of seafood (small fish, shellfish, squid, etc.), often taken by kleptoparasitism from other seabirds (most often Brown Pelicans) and sealions.

[edit] References

  1. Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2017. The eBird/Clements checklist of birds of the world: v2017, with updates to August 2017. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
  2. BirdLife International (2008) Species factsheet: Larus heermanni. Downloaded from http://www.birdlife.org on 12/9/2008.
  3. Handbook of the Birds of the World Alive (retrieved December 2016)

[edit] External Links

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