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What Is the Christmas Bird Count?
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Boreal chickadee (Poecile hudsonicus) The Christmas Bird Count is accessible to all age groups Comparing the 1st and 125th Christmas Bird Counts
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Boreal chickadee (Poecile hudsonicus)
Data from the Christmas Bird Count suggests a decreasing trend for the population...
© Matthew Jolley/stock.adobe.com
The Christmas Bird Count is accessible to all age groups
The National Audubon Society has also organized less-rigorous bird-counting programs...
© ArtMassa—iStock/Getty Images

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Comparing the 1st and 125th Christmas Bird Counts
Twenty-seven birders took part in the first count, observing birds at 25 locations...
Encyclopædia Britannica, Inc.