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Bird Alarm Calls Size Up Predators

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Science  24 Jun 2005:
Vol. 308, Issue 5730, pp. 1853-1855
DOI: 10.1126/science.308.5730.1853a

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Summary

On page 1934, researchers report that black-capped chickadees have a sophisticated system of alarm calls that conveys information about the size of potential predators and appears to help the chickadees mount a coordinated defense that is calibrated to the predatory threat.