Sexual selection accelerates signal evolution during speciation in birds.
Seddon N, Botero CA, Tobias JA, Dunn PO, Macgregor HE, Rubenstein DR, Uy JA, Weir JT, Whittingham LA, Safran RJ. Sexual selection accelerates signal evolution during speciation in birds. Proc Biol Sci. 2013 Sep 07; 280(1766):20131065.