From Opus

Photo by BirdsPeru
Location: Ticlio, Lima, Peru, August 2006

Chroicocephalus serranus

Larus serranus

[edit] Identification

Adult Breeding

• Black hood
• White eye crescents
  

Adult Non-breeding

• Hood recedes to leave a blackish ear spot

[edit] Distribution

Argentina, Bolivia, Chile, Colombia, Ecuador, and Peru.

Photo by Ecuadorrebel
Lake Limpiopungo, Ecuador, February 2009

[edit] Taxonomy

This is a monotypic species. ^[1]

Some authorities still consider it a part of genus Larus.

[edit] Habitat

Coasts, rivers, freshwater mountain lakes to at least 4600m, saline marshes, and pastures and plowed fields.

[edit] Behaviour

They can be found on big groups on most of the lakes in the high andes.

Winter adult and immatures
Photo by Rodrigo Reyes
Arica, northern Chile September 2008

[edit] References

1. Clements, JF. 2008. The Clements Checklist of Birds of the World. 6th ed., with updates to December 2008. Ithaca: Cornell Univ. Press. ISBN 978-0801445019.
2. Arthur Grosset
3. Wikipedia
4. BF Member observations

• List of references

[edit] External Links

• Arthur Grosset's Birds