In this Dec. 11, 2004, photo provided by Gill Robert, an independent contributor for the Beak Deformity and Banded Bird Observation Report/USGS Alaska Science Center, shows a black-capped chickadee with a deformed beak in Anchorage, Alaska. (Gill Robert/Beak Deformity and Banded Bird Observation Report/USGS Alaska Science Center via AP)
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