Abstract
We trapped shrews during 5 summers on small islets in a lake. All young shrews (n=55) caught from the islets were natal dispersers. We used several skeletal characters to compare the morphology of the disperses and the mainland residents. In 3 yr the dispersers were significantly smaller in body size (weight of bones) than the residents, and/or the dispersers had significantly smaller values of specific mandibular characters. These same mandibular characters (but not body weight) were significantly correlated with an individual's performance in neutral arena tests
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