Data from: With a little help from my kin: barn swallow nestlings modulate solicitation of parental care according to nestmates’ need

Andrea Romano, Manuela Caprioli, Giuseppe Boncoraglio, Nicola Saino & Diego Rubolini
In altricial species, offspring competing for access to limiting parental resources (e.g. food) are selected to achieve an optimal balance between the costs of scrambling for food, the benefits of being fed and the indirect costs of subtracting food to relatives. Since the marginal benefits of acquiring additional food decrease with decreasing levels of need, satiated offspring should be prone to favour access to food by their needy kin, thus enhancing their own indirect fitness,...
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