Lethmate, J., D?cker, G. 1973. Studies on self-recognition in a mirror in orang-utans, chimpanzees, gibbons and various other monkey species [article in German]. Zeitschrift f?r Tierpsychologie [Ethology] 33, 248-269.
Apes show every sign of recognizing themselves in a mirror, going so far as to embellish themselves in front of it.
Year
1973