Structure and Function of the Vocalizations of Tree Squirrels (Tamiasciurus)

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Abstract
The two species of squirrels in the genus Tamiasciurus each have five vocalizations in common use. Four of these are related to control of aggressive interactions and advertisement of territorial ownership. The fifth is used to warn of the presence of a potential predator. This paper describes the sound structure of each vocalization and the social situations in which each is used. In addition, the paper discusses the effect of environmental and social differences on the evolution of differences in the vocalizations between squirrel species and between squirrels and birds.

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