Foraging costs of a tail ornament: Experimental evidence from two populations of barn swallows Hirundo rustica with different degrees of sexual size dimorphism

@article{Moller2004ForagingCO,
  title={Foraging costs of a tail ornament: Experimental evidence from two populations of barn swallows Hirundo rustica with different degrees of sexual size dimorphism},
  author={Anders Pape Moller and Florentino de Lope and J. M. L{\'o}pez Caballero},
  journal={Behavioral Ecology and Sociobiology},
  year={2004},
  volume={37},
  pages={289-295}
}
Secondary sexual characters are assumed to be costly to produce or maintain. A test of this assumption was performed using the sexually exaggerated outermost tail feathers of male barn swallows Hirundo rustica, a trait currently subject of a directional female mate preference. A possible cost of sexual signalling in male barn swallows arises from increased flight cost during foraging in this aerially insectivorous species. A longer tail may impose a greater drag during flight and thereby affect… CONTINUE READING