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From: "Tom Grey" <[[email protected]]>
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Subject: [SBB] Pluvialis chibanensis
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Les Chibana modified one of my digiscopes of the contested Golden Plover so
as to ... well let me quote Les:

   "FWIW, I took the liberty of adding some lines to your image 2 to help
   distinguish the relative measurements for eye-to-bill-base vs. wing
   extension. I made two lines because Paulson doesn't specify exactly
   where one measures the eye to bill base: whether to base of culmen
   or gape. I also sharpened the image a bit to help define the primary
   tips. Using either measurement, red or blue line, the wing extension
   seems equal to or longer than either eye-to-bill measurement..."

   "Hayman, Marchant & Prater don't seem to use this measurement, rather
   they use the relative value of bill length X tarsus length. They provide
   both range of measurements but, obviously, this is useful only when
   one can measure in-hand. They also note a slight overlap of wing length
   ranges for both species."

Thanks to Les! And for what light it may cast, here it is... ("Northern
California birders have photographed an apparent Pluvialis plover with a
most unusual plumage variation...")

http://www.geocities.com/tgrey41/GoldenPlover2mod.jpg

Tom Grey
[[email protected]]

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