[obol] More on Hermit vs Swainson's Thrush

  • From: Kay Carter <KayCarter001@xxxxxxxxxxx>
  • To: "obol@xxxxxxxxxxxxx" <obol@xxxxxxxxxxxxx>
  • Date: Fri, 17 Dec 2021 19:35:47 +0000

I've been following the thread about primary emargination in Hermit Thrushes 
with interest.  Searching for photos showing the difference between the 
primaries of Hermit and Swainson's, I found several photos of Swainson's that 
seemed to show emargination on them, too, though slightly different from that 
of Hermit.  Below are shots of the primaries of both species from The Feather 
Atlas (https://www.fws.gov/lab/featheratlas/index.php).  So, there is some 
emargination in both species, though on a different number of feathers and in 
different proportions.  Alas, this no longer seems like a (kind of) easy way to 
tell them apart with just an unusually good view.  We're back to needing them 
in hand, or having especially good photos to study at leisure.  Or just rely on 
"if it's winter it's Hermit."

Kay Carter
Canby


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