In 1993, Dr. Robin I. M. Dunbar, an evolutionary psychologist then at the Human Evolutionary Biology Research Group of the University College London anthropology department, was studying the behavioral ecology of primates, the relationship of primates to their environment. Dunbar analyzed numerical data from primate studies conducted worldwide. He observed certain "defining behavioural characteristics," such as "the time devoted to social interaction, the level of social skills and the degree of tactical deception practiced."