Desperately Seeking Similarity

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Science  20 Jun 2003:
Vol. 300, Issue 5627, pp. 1887-1889
DOI: 10.1126/science.1085692

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In cooperative animals, kin selection theory predicts that cooperative breeding should arise among relatives. In their Perspective, Dickinson and Koenig explain that such a prediction has a number of complications, as exemplifed by studies in two species of cooperative breeders: carrion crows and side-blotched lizards ( Baglione et al., Sinervo and Clobert).