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Journal Article THE EVOLUTION OF BILL SIZE DIFFERENCES AMONG SYMPATRIC CONGENERIC SPECIES OF BIRDS Get access Thomas W. Schoener Thomas W. Schoener Biological Laboratories, Harvard University Cambridge Massachusetts Search for other works by this author on: Oxford Academic Google Scholar Evolution, Volume 19, Issue 2, 1 June 1965, Pages 189–213, https://doi.org/10.1111/j.1558-5646.1965.tb01707.x Published: 01 June 1965 Article history Accepted: 21 November 1964 Published: 01 June 1965
Thomas W. Schoener (1965) studied this question.