Sex-role reversal in willow tit nest defence

@article{Rytknen2005SexroleRI,
  title={Sex-role reversal in willow tit nest defence},
  author={Seppo Rytk{\"o}nen and Markku Orell and Kari Koivula},
  journal={Behavioral Ecology and Sociobiology},
  year={2005},
  volume={33},
  pages={275-282}
}
The roles of sexes in the nest defence behavior of monogamous willow tit (Parus montanus) were studied near Oulu, northern Finland, in 1988–1990. The relative roles of the sexes changed during the breeding cycle: females defended their nests more vigorously before hatching and males defended more after hatching. This sexual asymmetry was studied by means of the cost/benefit model of optimal parental investment (PI). Because of the monogamous breeding system, sexual differences in future… CONTINUE READING
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