Long-tailed Jaeger

Stercorarius longicaudus

ML263598001



eBird Checklist S73678562
Sep 16, 2020 2:10 PM 48.201, -106.404
Valley, Montana, United States
Search this location, Illustrated Checklist
Latitude and Longitude 48.2006, -106.4037 Map

Age
Not specified
Sex
Not specified
Behaviors
Breeding
Tags

Media notes

Observation details

Dark morph juvenile Jaeger studied at length with Woody Baxter who found the bird approximately one week ago. Smaller head and bill shape (shorter and thicker when compared to photos of Parasitic) favor Long-tailed. Bill approximately one-half black with more shallowly hooked bill than expected for Parasitic. Gonydeal angle also farther from bill tip than expected for Parasitic. Bird lacked buffy chevrons on primaries, lacked dark cap with paler streaked nape, and in general lacked any buffy tones that would suggest Parasitic. When wings were raised and in flight, it appeared that 2 possibly 3 white primary shafts were seen, but this was not seen with as high confidence as other field marks. Additionally, heavily barred undertail coverts were black with straight white to off-white barring, which also suggests Long-tailed. Observed for ca. 2 hours foraging in old ag stubble for grasshoppers and other insects. Photos.

Technical Information

Model
Canon PowerShot SX420 IS
f-stop
f/6.6
Focal length
180.6 mm
Shutter speed
1/250 sec
ISO
100
Flash
Flash did not fire
Original file size
2,999KB
Dimensions
4621 x 3286

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