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Checklist S20745992

 
Location
Bear River MBR -- Auto Tour Loop, Box Elder County, Utah, US ( Map ) ( Hotspot )
Date and Effort
Fri Nov 28, 2014 11:00 AM
Protocol:
Traveling
Party Size:
2
Duration:
3 hour(s), 20 minute(s)
Distance:
12.0 mile(s)
Observers:
Ben Bright
Comments:
Post-Thanksgiving trip with Fred. Great weather.
Species
28 species (+1 other taxa) total
20
10

© Ben Bright

Average Quality
10
2

clearly observed white on secondaries (not visible in picture)

© Ben Bright

Average Quality
9
70

very conservative estimate

25
5

© Ben Bright

Average Quality
3
2
15
12
1
4

© Ben Bright

Average Quality
5

one group of two and another group of three

© Ben Bright

Average Quality
30

conservative estimate

15

one with an injured leg

© Ben Bright

Average Quality
1

slightly upturned bill, near avocets

20
2
1
Herring x Glaucous Gull (hybrid)

I think this is an immature Glaucous based on 1) its large size (much larger than California Gulls that it was not getting along with), 2) overall dirty white plumage, 3) bill color (very pink with well-defined black tip with a pink point on the very end of the bill), and 4) most importantly, very light, whitish primaries and tail. Even though light and pictures can be deceiving, the primaries and tail of a Herring wouldn't have appeared so light. Also observed in the field but not too apparent on photos were pinkish legs. I didn't know what to look for in the field to distinguish large gulls so I am going solely off of these photos:

Feb 2016 update: Ryan O'Donnell noted that the primaries appear too dark for a pure Glaucous Gull, and suggested that this bird could be a first-cycle "Nelson's Gull" (Herring Gull x Glaucous Gull hybrid).

© Ben Bright

Average Quality

© Ben Bright

Average Quality

© Ben Bright

Average Quality
4
4
1

© Ben Bright

Average Quality
2
2

© Ben Bright

1
3
18
 

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

Yes