Sex-linked Yellow-cheek Cockatiel

First established by a German breeder, Bruno Rehm, in the 1990s. Birds with this morph essentially do not form their signature red/orange cheek spot. While they are visually very similar to other cheek-changing mutations, yellow-cheek is not closely related to them. A female is pictured.

This image came from a website called cockatiels.za.net, which is down at the time of writing.

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