This test consists in allowing the experimental subject freely exploring an unfamiliar congener in its homecage or in a neutral environment. Social exploration is measured by the time spent by the experimental subject around the congener as well as the amount and duration of behaviors that compose social interaction (e.g. sniffing, following, allogrooming, biting, mounting, wrestling…). Social avoidance behavior is used in a wide variety of models, for instance for assessing neophobia anxiety and depression-like behaviors.