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Science  05 Apr 2002:
Vol. 296, Issue 5565, pp. 29-31
DOI: 10.1126/science.296.5565.29a

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Summary

Seasonal cues such as day length help birds calibrate their breeding. Now a study on page 136 shows that some birds also adjust their efforts according to lessons they learned the previous year. The finding implies that such birds might be able to accommodate some environmental changes spurred by global warming, but scientists caution that such adjustments may be limited.