Mirror-image responses in pygmy marmosets (Cebuella pygmaea) (1983)

Eglash, A. R., Snowdon, C. T.

Abstract

The pygmy marmosets displayed a rapid extinction of social threat responses to their own image and of novelty responses to mirrors, but continued to show mirror-specific responses such as following their own image, playing peek-a-boo, and looking at their image throughout a 28-day period of mirror exposure. ...The pygmy marmosets used a mirror to locate otherwise unseen conspecifics from other groups and directed threat responses toward the real location of these animals rather than to their mirror-image.