habituation procedures are used by researchers for many reasons. for example, in a study on aggression in female chimpanzees from a group known as the ""kasakela chimpanzee community"", researchers habituated the chimpanzees by repeatedly exposing them to the presence of human beings. their efforts to habituate the chimpanzees before the field researchers studied the animal's behavior was necessary in order for them to eventually be able to note the natural behavior of the chimpanzees, instead of simply noting chimpanzee behavior as a response to the presence of the researchers. in another study, mitumba chimpanzees in the gombe national park were habituated for at least four years before the introduction of systematic data collection.