Possibly you have ever registered a white bird or one that has part of its white plumage when in fact it is not the typical plumage of the species. Well, surely they are cases of birds that suffer some chromatic aberration that are mainly due to failures in the production and/or deposition of the melanin pigment, either excess (melanism) or defect (albinism or leucism, among others). To understand it better and see some examples do not miss the video.