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Nature 412, 396 (26 July 2001) | doi:10.1038/35086691

Open Innovation Challenges

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Population ecology: Birds in a buffer state

Rory Howlett

There is a happy history of long-term data collected by volunteer ornithologists being used to tackle ecological questions. The latest example is described elsewhere in this issue (Nature412, 436–438; 2001) by Jennifer Gill and colleagues.