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Checklist S38936802

 
Location
Montrose Point, Lincoln Park, Chicago, Cook County, Illinois, US ( Map ) ( Hotspot )
Date and Effort
Fri Sep 01, 2017 6:48 AM
Protocol:
Stationary
Party Size:
1
Duration:
3 hour(s), 6 minute(s)
Observers:
Matthew Cvetas
Submitted from eBird for iOS, version 1.5.149
Species
13 species (+1 other taxa) total
75
8
13
3
35
1
3
1

Light juvenile. Too small for POJA. Long-winged, superficially similar to gull but browner topside with pale collar, pale rump. Wing base similar in width to tail length. Photos show stacked pointed central rectrices.

These two photos clinch the ID for me, showing warm light brown tones especially on the head. LTJA is typically a cooler gay/brown color overall. The upper tail coverts are clean white around the edges and then barred, offset from the more uniform brown mantle. On light juvenile LTJA, the upper tail coverts are primarily barred and the mantle with white feather edges giving it a more uniform look. You can see five prominent white feather shafts at the base. While the images do not show how far these extend down the primaries, the impression is that there are more than the expected 2-3 of LTJA.

https://flic.kr/p/X45MuW
https://flic.kr/p/Y4LEWq

1
jaeger sp.

One dark morph. White wing flashes evident. Fast and falcon like. Sent all gulls into a panic.

100
9
125
2
4
 

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

Yes