Abnormal eye colour in a Sombre Greenbul Andropadus importunus

Abstract

On the 16 April 2017 a Sombre Greenbul (Ring BE79158) was captured in a dry river bed on a dry Karoo farm called Modderfontein farm. The left eye is the typical adult eye colour with a white iris and small pupil. However, the right eye has a larger pupil and is greyish blue in colour.