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Checklist S37725601

 
Location
Lezíria Grande de Vila Franca de Xira--Poça do Cardal, Vila Franca de Xira County, Lisboa, PT ( Map ) ( Hotspot )
Date and Effort
Fri Jun 16, 2017 12:31 PM
Protocol:
Traveling
Party Size:
2
Duration:
2 hour(s), 49 minute(s)
Distance:
13.4 mile(s)
Observers:
Dominic Mitchell , Helder Cardoso List
Submitted from eBird for iOS, version 1.5.140
Species
32 species total
1
1
3
1

Very worn first-summer individual actively moulting in second-generation inner primaries, photographed in gull flock on rice fields alongside many Lesser Black-backed and several Yellow-legged Gulls. First seen by Helder Cardoso, who drew attention to its smaller size than congeners. When I examined my photos subsequently, I believed the structure and white-headed, 'snouty' appearance favoured Audouin's over e.g. a worn and bleached first-summer Mediterranean Gull, while the brown greater coverts eliminated Common Gull (with Ring-billed ruled out on a number of features). The 'piano-key' tail pattern appeared somewhat unusual and not to my knowledge a typical feature of any likely species, but subsequent discussion of this bird on the Western Palearctic Gulls Facebook group generated a link to images of an Audouin's with a similar tail pattern (see http://www.elisanet.fi/hj.koskinen/2kvLaraud20080627.html). In summary, no single feature of this bird is wrong for Audouin's, while all potential confusion species can be ruled out on one or more characters visible in the accompanying photos.

© Dominic Mitchell

Average Quality
Age:
Immature

© Dominic Mitchell

Average Quality
Age:
Immature

© Dominic Mitchell

Average Quality
Age:
Immature

© Dominic Mitchell

Average Quality
Age:
Immature

© Dominic Mitchell

Average Quality
Age:
Immature

© Dominic Mitchell

Average Quality
Age:
Immature
3

Second-calendar-year birds present among large numbers of Lesser Black-backed Gulls (others possibly overlooked)

120
33
22
13
21
73

Common, numerous species which was counted systematically

74
7
4
1
2
7
2
5
4
5
6
1
18
2
21

Subspecies iberiae

10
2
81
1
10
2
 

Are you submitting a complete checklist of the birds you were able to identify?

Yes