Absence of self-recognition in a monkey (Macaca fascicularis) following prolonged exposure to a mirror. 
To date only chimpanzees, orangutans, and humans have been found capable of recognizing themselves in mirrors.  In an attempt to provide a more definitive test of the capacity for self-recognition in monkeys.  I gave a preadolescent crab-eating macaque 2400 hr of mirror exposure.  However, patterns of self-directed behavior never developed and a more explicit test of self-recognition yielded negative results.  The data indicate possible differences between great apes and monkeys in self-awareness.