Cockburn, AndrewKim SterelnyRichard JoyceBrett CalcottBen Fraser2015-12-109780262018531http://hdl.handle.net/1885/59527The publisher permission to archive the version was granted via email on 21/09/16Published as: K. Sterelny, R. Joyce, B. Calcott, and B. Fraser (eds.), Cooperation and Its Evolution, © 2013 MIT, Cambridge, MA: The MIT Press (pp. 223‐246.)Cooperative Breeding in Birds: Toward a Richer Conceptual Framework2013.7551/mitpress/9033.003.00142021-08-01