Abstract
Age estimations according to the degree of tooth wear were carried out on a House Mouse (Mus musculus praetextus) population from the Nile valley in Central Egypt. The age structure of mice caught with traps was compared with that of mice recovered from simultaneously collected Barn Owl (Tyto alba) pellets. Although these two sampling methods did not reveal significant differences in Mus age strucure, a comparison according to season resulted in significantly increased numbers of young mice (age class 2) preyed upon by the Barn Owl in the period between March and May. The Barn Owl thus affects the age structure of the House Mouse during spring.
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