Abstract
Parental care towards experimentally restrained white-throated sparrow, Zonotrichia albicollis, fledglings was examined for evidence of brood division. Brood division occurred in 14 of 17 broods and was characterized by distinct but overlapping preferences by parents for particular brood members. The combined efforts of the parents usually resulted in an even distribution of resources among the brood. However, in some cases, brood division caused some fledglings to receive more food than others. Within-brood variation in food received was correlated with the difference between parents in parental effort. Brood division was maintained by the location of the young for some parents and by the identity of the young for other parents. It is suggested that changes in brood mobility might necessitate a shift in the cues used to discriminate between fledglings in order for parents to maintain brood division through the post-fledging period.
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