The arrival of autumn brings certain reliable joys—pumpkins ripe and ready for Halloween, the explosion of fall colors, and the excitement of playoff baseball on cool October nights.
For birding enthusiasts in the United States, autumn also means the arrival of 3 billion to 5 billion birds migrating from summer breeding grounds in the boreal forest of Canada and Alaska to wintering habitats in the lower 48 states and farther south.
As they retreat from the onset of winter cold in the north, these...
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