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Science  07 Feb 2014:
Vol. 343, Issue 6171, pp. 583-585
DOI: 10.1126/science.343.6171.583-c

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Summary

Record low numbers of monarch butterflies wintering in Mexico have researchers worried that the stunning annual migration is dwindling. And in an effort to track the changing habits and diet of polar bears, Quinoa the Dutch shepherd applies his scat-sniffing prowess.