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adaptiveness of certain bird behaviors.
The Birder’s Handbook cites studies showing that breeding populations are limited by winter conditions. so their choices of wintering grounds are critical to their survival.
But migratory birds that winter in Rappahannock — and this includes a fair number of slate-colored juncos, white-throated sparrows, white-crowned sparrows, purple finches and pine siskins — are probably here for a variety of good reasons.
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