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Old Sunday 10th December 2017, 14:53   #133
SteveMM
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Join Date: Jan 2015
Location: Tainan, Taiwan
Posts: 349
The other usual one is taimyrensis.

In contrast to the mongolicus, this first-winter is still juvenile with solidly blackish-brownish greater coverts and no real signs of wear. The adults (or near) still have a long way to go to complete their primary moults and have secondaries still growing.
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