Oriental Bird Images
 

 
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White-eared Bulbul Pycnonotus leucotis leucotis   - Colour aberrant individual
White-eared Bulbul
Photographer : © Ashwin Dev
Location :on Ahmedabad Highway near Nal Sarovar Bird Sanctuary, Ahmedabad District, Gujarat, India
Date : 8 February 2019
English synonyms:White-cheeked Bulbul
Bird Family :Pycnonotidae - Asian Bulbuls, Finchbills & Malia
Bird Group :PASSERIFORMES
Red Data Status :Least Concern
Remarks :This bird was flocking with White-eared Bulbuls and Red-vented Bulbuls Pycnonotus cafer. This was the only colour aberrant bird in the area. - AD

A nice example of progressive greying. - Hein van Grouw
Refs:
Grouw, Hein van (2006) Not every white bird is an albino: sense and nonsense about colour aberrations in birds. Dutch Birding 28: 79-89.
Grouw, Hein van (2013) What colour is that bird? The causes and recognition of common colour aberrations in birds. British Birds 106: 17-29.