1. the presence of physical or behavioral traits in one species that so closely resemble those of another species that they confuse observers. This resemblance makes it possible for an organism either to evade predators (see Batesian mimicry; Müllerian mimicry) or to attract prey (see aggressive mimicry).

2. a form of social learning in which people, without conscious awareness or intent, automatically copy other people’s physical movements (behaviors such as postures, gestures, and mannerisms), facial expressions, speech patterns, and emotions during interpersonal interactions. It is thought that the behavioral form in particular, called behavioral mimicry, arises out of the need to affiliate and facilitates an effort to establish rapport with others. See also emulation; imitation; local enhancement.