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פרטי השורה
*Rare. Individual first spotted on telephone poles briefly at School St. Fields, then crossed Route 2 and sat on the Mass State Police house (the white one next to the barn). Then flew behind the house and perched on the chain link fence behind the horses. Then flew off into the marshy area behind that. Very flighty. Fairly good traits supporting this subspecies: In favor of abieticola: 1) Completely dark throat. Of this type, one of the most completely dark throats I’ve seen. 2) Brown streaks coming from edge of throat and into breast, making for a non-white, streaky bib, unlike the clean bib of borealis (bib ~= upper breast). 3) Uniform, dark streaking to belly band, including herringbone patterning towards the flanks. 4) Amber/buffy overtones overall on all lighter areas (underside, underwing), whereas borealis is typically more white-ish, lacking such overtones. 5) Dark, thick, subterminal tail band (borealis typically has little to no subterminal band). 6) Dark upperparts overall, including some areas that are bordering on blackish. (This trait has never been characterized in more specific detail, though. Some thoughts based on a brief review of photos: it seems like the difference is that typical borealis is lighter brown overall, with darker brown spots on wing coverts, scapulars, and front of face. Abieticola, though, is dark brown overall, with black-ish wing coverts, scapulars, and front of face.) Minor caveats: 1) Underwing patagial region lacks extensive dark patterning. Patagial patterning not out of range for borealis. But, underwing is still more amber-toned than expected in borealis. Wing tips appeared more extensively dark-patterned (not captured in these photos). 2) This is picky, but: breast band could be more blotchy ("globular"). This individual has extensive and uniform streaking, as well as herringbone, but lacks large blobs. However, it does have streaks that appear more teardrop shaped (ref 1). I think it’s just on the lighter end of the abieticola spectrum, though. It would be quite impressive streaking for a pure borealis. Also, there are several abieticola individuals online with even less of a belly band than this one (and thereby less blotchy). I'm fairly sure these traits make this individual an abieticola, but happy to hear input. Further, note that this individual is extremely similar to Marshall Iliff's Nov. 2020 bird at Millennium Park. There are several other individuals even within MA eBird records alone that have a similar belly band and similar underwing pattern, including some that have lighter (more borealis-like) overtones to their underside and underwings. This also includes Jason Forbes' Mar. 2014 bird at Mount Misery, which had a much lighter belly band, and was ID'd by dark throat and red-ish (amber-ish) breast alone. Interestingly, a typical borealis individual followed it the entire time, associating very closely. Not something I’ve seen before? An abieticola-borealis winter pair bond. Photos and video attached. The video goes black a couple times because the software tried to stabilize it but was unsuccessful in those regions. References: 1. Liguori, J. and Sullivan, B. L. 2014. Northern Red-Tailed Hawk Revisited. North American Birds, 67(3):374-383.
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