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Dairy declines hard to swallow

Birds are important constituents of any ecosystem. But they are also valuable monitors of environmental conditions — if their populations begin to decline, we need to know why.

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Figure 1: In decline — the barn swallow, Hirundo rustica.



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Correspondence to Peter D. Moore.

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Moore, P. Dairy declines hard to swallow. Nature 411, 904–905 (2001).

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