Byrne & Russon have argued that imitation is not an all-or-none phenomenon but may instead occur at different levels. Although I applaud their theoretical framework, their data provide little empirical support for the theory. Data from studies of human infants, however, are consistent with the view that imitation may occur at different levels. These data may provide better support for Byrne & Russon's hierarchical view of imitation than the nonhuman primate data that their theory was developed to explain.