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HotScience last updated: 19 February 2003
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Young, J.R.; Kearvell, J.C. 2001. Distinguishing between sexes and species: bill size in orange-fronted and yellow-crowned parakeets, Cyanoramphus auriceps. Emu 101:137-143, 2001.
Controversy surrounds the taxonomic status of the Orange-fronted Parakeet (previously known as Cyanoramphus malherbi), officially a colour morph of the more common Yellow-crowned Parakeet C. auriceps. We analyse bill length and bill width measurements from 60 museum specimens of Orange-fronted Parakeet and 44 museum specimens of Yellow-crowned Parakeet. Male Orange-fronted Parakeets have shorter bills than male Yellow-crowned Parakeets Ñ the difference between sample means is 0.7Ð0.8 mm. Power calculations show that others have most likely not seen the difference as significant because of small sample sizes. Our analysis illustrates a useful statistical technique for identifying morphological differences between two species where both species are sexually dimorphic but the sex of each individual is uncertain.
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