Migratory birds are arriving at their breeding grounds to find that spring has already sprung.
References
Both, C. & Visser, M. E. Adjustment to climate change is constrained by arrival date in a long-distance migrant bird. Nature 411,296-298(2001).
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Whitfield, J. Flycatchers caught on the hop. Nature (2001). https://doi.org/10.1038/news010517-7
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DOI: https://doi.org/10.1038/news010517-7
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