Redirection of filial attachments in rhesus monkeys: dogs as mother surrogates.

Rhesus infants raised from birth with their mothers, age-mates, or cloth surrogates for periods varying fronm 1 to 10 months were separated from these objects and placed with dogs. Contrary to previous suggestions that were consistent with the notions of a critical period for attachment formation and irreversibility of filial bonds, the monkeys formed strong and specific attachments to their canine surrogates.