Bill size polymorphism and intraspecific niche utilization in an African finch

@article{Smith1987BillSP,
  title={Bill size polymorphism and intraspecific niche utilization in an African finch},
  author={Thomas C. B. Smith},
  journal={Nature},
  year={1987},
  volume={329},
  pages={717-719}
}
The African estrildid finch, Pyrenestes ostrinus, shows a non-sex-linked polymorphism of bill size. Within P. ostrinus and its congeners, P. sanguineus and P. minor, variation in bill size is extreme, bimodally distributed and not determined by sex, age, body size or geographical origin. P. ostrinus appears to mate randomly with respect to bill size. Bill morphs differ with respect to diet and feeding performance on hard and soft seeds of sedges, Scleria spp. (Cyperaceae), the bird's principal… CONTINUE READING

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