colour change
(US color change)
noun
A change in colour; (Zoology ) the alteration in the colour of an animal's coat, skin, plumage, etc., either for camouflage (especially in response to change in the surroundings) or as a signal to others (e.g. as a warning, a cue for mating, etc.).
Origin
Mid 16th century; earliest use found in Thomas Nuce (c1545–1617), poet and translator.