
TY  - JOUR
A1  - Young, Jim R. 
A1  - Kearvell, Jonathan C. 
T1  - Distinguishing between sexes and species: bill size in Orange-fronted and Yellow-crowned Parakeets, <emph type="2">Cyanoramphus auriceps</emph>
JF  - Emu
JO  - EMU
Y1  - 2001
VL  - 101
IS  - 2
SP  - 137
EP  - 143
KW  - 
UR  - https://doi.org/10.1071/MU00010 
N2  - 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 &#8212; the difference between sample means is 0.7&#8211;0.8 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. 
ER  -

