Campagna, L., Benites, P., Lougheed, S.C., Lijtmaer, D.A., Di Giacomo, A.S., Eaton, M.D. & Tubaro, P.L. 2012. Rapid phenotypic evolution during incipient speciation in a continental avian radiation. <em>Proceedings of the Royal Society of London B, </em>279: 1847-1856.