‘the origin of birdsong must therefore lie not only in sexual selection and competition among males, as suggested by Darwin. It seems more probable that sexual and social selection also played a role in females: song allowed both males and females to compete for the resources necessary for survival and reproduction.’
¡Qué interesante! El resumen del artículo, aquí.
Y la noticia en la web de la Universidad de Leyden, aquí.