A meta-analysis of 143 bird species finds huge variation in parental responses to chicks' begging signals, and shows that parental strategies depend on environmental factors, such as the predictability and quality of food supplies.
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Mock, D. Some begging is actually bragging. Nature 532, 180–181 (2016). https://doi.org/10.1038/nature17317
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DOI: https://doi.org/10.1038/nature17317
