see http://www.sciencedaily.com/releases/2011/03/110330192544.htm
C. E. Studds, P. P. Marra. Rainfall-induced changes in food availability modify the spring departure programme of a migratory bird. Proceedings of the Royal Society B: Biological Sciences, 2011; DOI: 10.1098/rspb.2011.0332 ===============================
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