PhysOrg Posted December 16, 2019 Posted December 16, 2019 Over three weeks starting Saturday, thousands of birders in the Western Hemisphere will take part in the annual, 119-year-old Audubon Christmas Bird Count. These tallies are conducted in prearranged circles within a seven-mile radius of a central point. At least 30 such circles exist in Southern California, and counts in each are held during a planned 24-hour period, rain or shine. View the full article
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