Cooper's Hawk

Accipiter cooperii

ML234437691



eBird Checklist S69002299
Pillar Point Harbor--Denniston Creek mouth
San Mateo, California, United States
Search this location, Illustrated Checklist
Latitude and Longitude 37.5039, -122.487 Map

Age
Unknown
Sex
Unknown
Behaviors
Breeding
Tags

Media notes

Observation details

I wrestled a bit with the ID of this immature accipiter, but wound up going with Cooper's instead of Sharpie. Overall, when perched, the head seems fairly proportionally sized to the body, it has that somewhat "mean" look versus "surprised" look of a Sharpie, also the tarsi ("shins") and toes seem quite robust. In flight, the tail appears quite long and the head projection is well beyond the wings. Hence, though a few field marks suggest immature Sharpie (e.g. breast streaking quite thick and not tapering off towards the belly, tail tip seemed more squarish in the field, though photos do show slight rounding of a Cooper’s), in aggregate, it seems most field marks point to Cooper's rather than Sharpie for this bird, overall structure wins out in this case.

Technical Information

Model
Canon EOS 7D
Lens model
EF100-400mm f/4.5-5.6L IS USM
f-stop
f/5.6
Focal length
400 mm
Shutter speed
1/8000 sec
ISO
1000
Flash
Flash did not fire, auto
Original file size
288KB
Dimensions
1721 x 1147

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