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Checklist S29741700

 
Location
Rodeo Lagoon, Marin County, California, US ( Map ) ( Hotspot )
Date and Effort
Tue May 17, 2016 8:30 AM
Protocol:
Traveling
Party Size:
1
Duration:
1 hour(s), 5 minute(s)
Distance:
1.0 mile(s)
Observers:
William Legge
Comments:
Wind W (light sea breeze), sunny with temperatures rapidly climbing to 22C/72F. Quick look at the eastern end of the main lagoon and inner lagoon.
Species
40 species total
4

Two pairs

1

Medium sized duckling in the inner lagoon with no sight of Mum

2
1
41

A surprising sight moving purposefully NNW very high over the main lagoon in a loose flock some fly catching as they went at circa 8:45am. Only picked them up when looking skyward at three Great Blue Herons that were dropping down to the lagoon, and I saw the swifts high above the herons virtually undetectable with the naked eye. Initially I counted only 10-12 but as they flew further way northwestwards over the Headlands, I was able to count 41 in a wide sweep. Large and all black with longish tails - almost as long as the wings. Tails looked pointed rather than square ended at the distance I was seeing them. Fight pattern was more like White-throated Swift and definitively NOT like a Vaux's Swift's stiff winged, fluttering jerky flight. Not too familiar with Black Swift and the high number in this flock make me pause, but these were not Vaux's Swift and the light was good looking northward into clear blue sky from the Marin Headlands Visitor Center Car Park when I saw them, and no white plumage was detected at all. All black. I see that 14 Black Swift were seen at Battery Godfrey in the SF this morning as well, and given the hot conditions I suspect there was a movement of this species over the Bay Area today.

3
8
2

Flew over SE

1

On the main lagoon (non-breeding plumage)

5

Flew N offshore

3

A group of three (and adult, 1st year and a juvenile circled and landed in trees before leaving SE 30 minutes later.

2
1
1

Heard only

1

Soaring high overhead

3
2
2
1
3
1
1
1
1
4
5
2
3
1
2
3
2
2
9
2
1
1
2
Breeding Code
FL Recently Fledged Young (Confirmed)
5
1

Heard in song only from the willows adjoining the inner lagoon

 

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

Yes