The act of copying the sounds or behaviour of a particular person or animal, in order to make people laugh. (Cambridge Dictionary)
To copy the way in which a particular person usually speaks and moves usually in order to make people laugh. (Cambridge Dictionary)
The action or skill of imitating someone or something, especially in order to entertain or ridicule. (Oxford Dictionaries)
The action, practice, or art of mimicking. (Merriam – Webster)
Insect Mimicry & Camouflage.