Broad parasitic cowbird nestlings use host young to procure resources

Rebecca M. Kilner, Joah R. Madden, Mark E. Hauber

Research output: Contribution to journalArticlepeer-review

Abstract

Young brood parasites that tolerate the company of host offspring challenge the existing evolutionary view of family life. In theory, all parasitic nestlings should be ruthlessly setf-interested and should kill host offspring soon after hatching. Yet many species allow host young to live, even though they are rivals for host resources. Here we show that the tolerance of host nestlings by the parasitic brown-headed cowbird Molothrus ater is adaptive. Host young procure the cowbird a higher provisioning rate, so it grows more rapidly. The cowbird's unexpected altruism toward host offspring simply promotes its selfish interests in exploiting host parents.

Original languageEnglish (US)
Pages (from-to)877-879
Number of pages3
JournalScience
Volume305
Issue number5685
DOIs
StatePublished - Aug 6 2004
Externally publishedYes

ASJC Scopus subject areas

  • General

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