Christmas Bird Count: An 80-Year Review of Species Trends in Portland
For more than 100 years, Bird Alliance of Oregon has organized the Christmas Bird Count (CBC) in the metro area, recruiting volunteers to fan out across a 15-mile-wide circle to identify and count every bird seen or heard. Results from all Christmas Bird Counts are contributed annually to National Bird Alliance of Oregon, whose database includes data from thousands of CBC circles across North America and the world.
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