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Checklist S38492369

 
Location
Rodeo Lagoon, Marin County, California, US ( Map ) ( Hotspot )
Date and Effort
Sat Aug 05, 2017 7:00 AM
Protocol:
Traveling
Party Size:
1
Duration:
2 hour(s)
Distance:
2.0 mile(s)
Observers:
William Legge
Comments:
Wind WSW, light to moderate, overcast with low fog with visibility between 300-1,000 yards as the fog rolled in off the ocean, 15C/59F. 30 minute sea watch from Rodeo Beach followed by a quick circuit of the main lagoon, cut short by the discovery of a Black Skimmer which became the focus of this morning's observations. Mammals of note: 3 River Otters in the main lagoon and 1 Harbor Seal offshore.
Species
34 species (+2 other taxa) total
2
3

On the ocean off Rodeo Beach

18
1
Rufous/Allen's Hummingbird
2

2 flew in off the ocean, circled high over the main lagoon calling and left east into the fog up Rodeo Valley with a flock of 8 peeps sp.

2

Feeding in the main lagoon outlet channel

8
peep sp.

Flew in off the ocean high, circled high over the main lagoon and left east up Rodeo Valley. Probably Least Sandpipers

95

80+ flew S offshore, 10 on the ocean off Rodeo Beach and 5+ on Bird Island

4

In flight or on the ocean off Rodeo Beach

150

150+ on Bird Island

35
3

Briefly fishing over the main lagoon

1

First noticed skimming over the main lagoon in the fog at c. 7:55am and last seen at 8:50am, although it disappeared in between and was seen flying out over the beach towards the ocean at 8:30am before returning 5 minutes later. It was on the wing the entire time seen, working the full length of the main lagoon and frequently 'skimming'. Age wise, probably a molting adult or 2nd calendar year bird (versus my initial thoughts of a juvenile). Size a little smaller than a Caspian Tern (in the same field of view) but slimmer, long winged with buoyant flight (when not skimming) recalling Black Tern. Dark slate-gray back and upper wing with bright white trailing edge to the wing, white collar, and smudged dark gray cap to head. Under parts white, and silver under-wing transitioning to dark gray at the primaries. Tail white with central dark gray line. Diagnostic large 'dagger' bill with much longer lower mandible, 2/3rds black from the tip, transitioning to red/dark pink towards the bill base. A real surprise at this location!

© William Legge

Black Skimmer - Rodeo Lagoon, Marin, CA - cropped poor record shot from handheld iPhone!

Age:
Unknown
Sex:
Sex Unknown

© William Legge

Back Skimmer at Rodeo Lagoon, Marin, CA - Poor record shot from handheld iPhone!

Age:
Unknown
Sex:
Sex Unknown

© William Legge

Black Skimmer at Rodeo Lagoon, Marin, CA - Poor record shot of back with handheld iPhone

Age:
Unknown
Sex:
Sex Unknown

© William Legge

Black Skimmer at Rodeo Lagoon, Marin, CA - Poor record shot using handheld iPhone

Age:
Unknown
Sex:
Sex Unknown
2

Flew S offshore

3

On the ocean off Bird Island

2

Main lagoon

50

15+ on Bird Island, and 20 flew N and 10-S offshore, plus 5+ visiting the main lagoon

2

Adult and a juvenile

1

Adult

1
1
4
1
1
4
1
1
7
3
2
2
1
2
1

Juvenile

4
2
 

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

Yes