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Annual mean beak dimensions with 95% confidence limits. Mean beak length of G. fortis is almost identical to mean beak depth as a consequence of a strong phenotypic correlation (5). G. scandens samples vary from 15 (1974) to 364 (1983) with a mean of 135, and G. fortis samples vary from 31 (1974) to 933 (1976) with a mean of 311.
