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Use "colouration" in a sentence
"This is the original jabiru, whilst the other species are imitations, having the same head and neck colouration, which is the reason they were given the same name."
"The dolphin appears to be healthy and normal other than its colouration, which is quite beautiful."
"Firstly, I suspect that some of those sheep have been photoshoped so there are more sheep of non white colouration than there actually are."