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Checklist S9376588

 
Location
Republic Landfill (restricted access), Bay County, Michigan, US ( Map ) ( Hotspot )
Date and Effort
Fri Dec 16, 2011 8:30 AM
Protocol:
Stationary
Party Size:
2
Duration:
3 hour(s), 15 minute(s)
Observers:
Nathan DeBruine List , Zachary DeBruine
Comments:
N/A
Species
11 species total
8
3
1250
1

Second cycle bird. Seen soon after arriving at the dump.

Age & Sex
Juvenile Immature Adult Age Unknown
Male
Female
Sex Unknown 1

© Zachary DeBruine

Average Quality
1

***MEGA.

Videos at blog post http://birdventure.blogspot.com/2011/12/mega-slaty-backed-gull.html.
We observed the bird from point A, and it spent most of it's time in the area between A and B, if not out of sight at B. Towards the end of our frigid stay the bird flew and landed right in front of s on the berm at point C. Wonderful looks were obtained!
Likely post-3rd year/adult. ID was extremely convincing: conspicuous slaty-gray dark mantle, dark pink legs, broad white line on rear of wings, readily apparent distinct brownish streaking on head and neck, muddy streak concentrated around eye, yellow iris, and obvious white subterminal spots on the primaries. Certainly not younger than 3rd winter, and likely 4th winter due to the moderate, but not dense, streaking on the breast.


Found by Dan Duso on December 12, and seen by perhaps a hundred birders since then. On Thursday morning, the bird's location was not known. After a 250-mile round-trip drive to see this bird, Nathan and I spent a painful 50 minutes searching in the freezing windy weather. After discovering 2 Great Black-backed Gulls, Nathan went on to find a 3rd dark-mantled gull down in the trash near the excavating site. He immediately confirmed the id based on the prominent streaking on the head and the large white tips on the rear wing, and dark pink legs. I managed a few rusty pics seconds later. The bird spent a minute moving around in the excavation site before rising to fly around the valley for a few minutes. It eventually perched nearly out of sight. Half an hour later, all the gulls in the landfill flushed and the SBGU was lost. It was refound a few minutes later above the drive on the grassy berm, preening and providing excellent looks for the next hour until we left.

Age & Sex
Juvenile Immature Adult Age Unknown
Male
Female
Sex Unknown 1

© Zachary DeBruine

Average Quality

© Zachary DeBruine

Average Quality

© Zachary DeBruine

Average Quality

Digiscoped by Nathan DeBruine.

15

Many all over the dump. Practiced videoing them on the move, and obtained several cool scenarios. Here¿s a snapshot from one HD video using my new camera:
Captured from Video. Note 2 GLGUs in one pic!

© Zachary DeBruine

Average Quality

Captured from Video. Two GLGUs in one pic!

2

One of these appeared to be significantly smaller than would be expected, especially when compared to the neighboring Glaucous Gull in the photo below.

Age & Sex
Juvenile Immature Adult Age Unknown
Male
Female
Sex Unknown 2

© Zachary DeBruine

Average Quality

© Zachary DeBruine

Average Quality

Digiscoped by Nathan DeBruine.

1
20
1
750
Additional species seen by Nathan DeBruine:
1
gull sp.
 

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

Yes