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Checklist S31384909

 
Location
Yolo Bypass Wildlife Area, Yolo County, California, US ( Map ) ( Hotspot )
Date and Effort
Fri Sep 02, 2016 5:30 PM
Protocol:
Traveling
Party Size:
1
Duration:
2 hour(s)
Distance:
3.0 mile(s)
Observers:
Kirk Swenson
Comments:
August shorebird tracts (across from Lot C) for most of the time. Brief stop at observation deck pond (across from Lot B) on the way out.
Submitted from eBird for iOS, version 1.2.6 Build 75
Species
36 species (+1 other taxa) total
80
Northern Shoveler
30
Gadwall
500
Mallard
6
Northern Pintail
20
Green-winged Teal
8
Ring-necked Pheasant
1
Pied-billed Grebe
30
Black-necked Stilt
14
American Avocet
1
Killdeer
400
Least Sandpiper
600
Western Sandpiper
1
Short-billed Dowitcher
200
Long-billed Dowitcher
1200
Short-billed/Long-billed Dowitcher

Probably a substantial underestimate. I estimated a thousand birds when I arrived and large flocks kept flying in for the 1.5 hours I was there.

20
Greater Yellowlegs
1
Long-tailed Jaeger

First spotted as a dark larid roosting alone in the second of the August shorebird tracts, perhaps 50-60 yards out, while all the other gulls and terns were in the first (westernmost) of the tracts. As an all dark bird with pale markings on the wings my first thought was juvenile California Gull, but as I focused the scope it resolved into a compact larid with crisply contrasting white feather-edgings in that characteristic juvenile Long-tailed Jaeger pattern. I spent maybe 30-60 seconds looking at the bird at rest as one part of my brain shouted "That _really_ looks like a Long-tailed Jaeger!" and another part of my brain said "Slow down. Let's make sure there isn't some other more logical explanation for this bird." During this time I noted the relatively stubby bill and at one point when it turned its head there was a bit of a sheen to the head and neck when they caught the light. At that point the bird lifted off and began flying towards me. As it did so, the white wing flashes were clearly visible leaving no doubt. I raised my camera and kept firing until the bird flew far enough towards the sun that further photos were pointless. During that time the bird initially flew north towards me, then veered west (toward the sun making all of my photos severely backlit), and then drifted further north, where eventually I lost it in the scope as well. Once I stopped shooting and started following it in the scope it never flapped again, it just circled higher and higher and drifted further north until I lost track of it. The total time of observation was probably five minutes or so. Reviewing the literature, I would say it looks most like an intermediate morph juvenile. All of my photos were severely backlit so I had to increase the exposure in post-processing to bring out the detail.

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

© Kirk Swenson

Average Quality

Long-tailed Jaeger, Yolo Bypass Wildlife Area, Yolo County, California

Age:
Juvenile

© Kirk Swenson

Average Quality

Long-tailed Jaeger, Yolo Bypass Wildlife Area, Yolo County, California

Age:
Juvenile

© Kirk Swenson

Average Quality

Long-tailed Jaeger, Yolo Bypass Wildlife Area, Yolo County, California

Age:
Juvenile

© Kirk Swenson

Average Quality

Long-tailed Jaeger, Yolo Bypass Wildlife Area, Yolo County, California

Age:
Juvenile
150
Ring-billed Gull
200
California Gull
41
Caspian Tern

Point count

2
Double-crested Cormorant
50
American White Pelican
4
Great Blue Heron
6
Great Egret
2
Snowy Egret
5
Black-crowned Night-Heron
150
White-faced Ibis
1
Belted Kingfisher
2
Black Phoebe
1
Horned Lark
1
Barn Swallow
6
Marsh Wren
1
Yellow-headed Blackbird
800
Red-winged Blackbird
1
Tricolored Blackbird
1
Great-tailed Grackle
4
Common Yellowthroat
 

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

Yes