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Positional behavior (posture and locomotion) studies are a category of primatological and anthropological field research that attempts to describe movement capabilities and expressed behavior within an evolutionary, ecological, and/or morphological context. This area of research is appealing because it allows the integration of morphological data (capabilities) with expressed behaviors and provides a basis for understanding fossil reconstruction. Because positional behavior acts as a mediator between the biology and the environment, it offers information about virtually all aspects of a primate's life. We are currently undergoing an increase in the number of field projects focusing on the development of positional behaviors in immature primates, and results suggest that in many species positional competence develops relatively early. In this review, I present information on recent positional behavior studies with a focus on how positional behavior develops in young primates. Research on immature primates suggests that natural selection operates at all life stages to influence survival and that the adult positional repertoire likely reflects the challenges confronted by younger individuals.
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