Summary
In experiments with wild blackbirds eating artificial pastry baits of two colours presented at high density, it has been argued elsewhere that selection was directional. The experiments have been repeated with a slightly different experimental design and the results indicate apostatic selection. Some indications of changes in selection behaviour by the blackbirds, both within and between visits, are also mentioned.
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References
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Harvey, P., Jordan, C. & Allen, J. Selection behaviour of wild blackbirds at high prey densities. Heredity 32, 401–404 (1974). https://doi.org/10.1038/hdy.1974.48
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DOI: https://doi.org/10.1038/hdy.1974.48
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