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adventitious
adventitious In this historical usage, adventitious protective resemblance means concealment gained by taking on actual materials from the surroundings, such as covering the body with parts of the environment.
In this historical usage, adventitious protective resemblance means concealment gained by taking on actual materials from the surroundings, such as covering the body with parts of the environment. It refers to camouflage by external addition rather than by the animal’s own built-in colouring or form.