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It has been suggested that male birds adjust their territory size in order to prevent potential intruders from gaining extra-pair copulations. The risk of cuckoldry is supposed to be highest when the distance between a female and the neighbouring males is shortest. This paper describes the variation in territory size of the chiffchaff,Phylloscopus collybita, in relation to the breeding cycle. Contrary...
It has been suggested that males of passerine bird species sing most actively during the fertile period of their mates partly as a paternity guard strategy and partly to maximize their own extra-pair copulation success. This investigation considers whether song is used as a paternity guard strategy in the chiffchaff,Phylloscopus collybita. The study was carried out in south-eastern England (Wytham...
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