Do adult eastern bluebird Sialia sialis males recognize juvenile-specific traits?

@article{Ligon2009DoAE,
  title={Do adult eastern bluebird Sialia sialis males recognize juvenile-specific traits?},
  author={Russell A Ligon and Geoffrey R Hill},
  journal={Animal behaviour},
  year={2009},
  volume={77 5},
  pages={1267-1272}
}
Juveniles of many avian species possess spotted or mottled plumage that is distinct from the plumage of adults. Such plumage has typically been assumed to aid in camouflaging vulnerable immature birds. Here, we propose that spotty plumage signals juvenile status, thereby decreasing aggression from territorial adults. We tested this hypothesis by measuring the aggressive responses of adult eastern bluebird males to different combinations of simultaneously presented taxidermic mounts. We found… CONTINUE READING
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