Morphometric, ecological, behavioral and plumage differences between alexandrinus and dealbatus as given by Kennerley et al. (2008) and their interpretation and score according to the criteria of Tobias et al. (2010).

Biometric measurements were taken from table 1 in Kennerley et al. (2008). Note that various extremely minor traits are not listed as these would not have qualified for scoring. Also note that vocal differences are not given as none are known. For the score on geographical relationship, see Results. Final score amounts to 8.