Western Gull occidentalis

(last update: 22-12-2016 )

Coordinators:
Alvaro Jaramillo
John Cant
Mars Muusse

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1cy June
1cy July
1cy Aug
1cy Sept
1cy Oct
1cy Nov
1cy Dec

2cy Jan
2cy Feb
2cy March
2cy April
2cy May
2cy June
2cy July
2cy Aug
2cy Sept
2cy Oct
2cy Nov
2cy Dec

3cy Jan
3cy Feb
3cy March
3cy April
3cy May
3cy June
3cy July
3cy Aug
3cy Sept
3cy Oct
3cy Nov
3cy Dec

4cy / sub-ad Jan
4cy / sub-ad Feb
4cy / sub-ad March
4cy / sub-ad April
4cy / sub-ad May
4cy / sub-ad June
4cy / sub-ad July
4cy / sub-ad Aug
4cy / sub-ad Sept
4cy / sub-ad Oct
4cy / sub-ad Nov
4cy / sub-ad Dec

adult Jan
adult Feb
adult March
adult April
adult May
adult June
adult July
adult Aug
adult Sept
adult Oct
adult Nov
adult Dec

Western Gull occidentalis pre-basic moult (4CY), June 1989, California, USA. Picture: Alex Abela.

3rd gen P10 without mirror, now bleached. Note pattern of black centres on 3rd gen rectrices and central TT. Several brown toned feathers in wing-covert panel. 3rd gen secondaries with bold white tips. Bare part starts to become more saturated (affected by hormons in spring).

Complete moult started This is reflected by moult in the coverts: central MC dropped.