EN
Direct observations of the behaviour of bank voles Clethrionomys glareolus (Schreber, 1780) and striped-field mice Apodemus agrarius (Pallas, 1771) were carried out in semi-natural conditions (enclosure). Intra- and interspecific behaviours in both voles and mice were similar. A quick escape of animals was observed as a result of the majority of meetings (ca 70%); fights among individuals were not frequent (usually about 10% of meetings). It seems that interactions among the two studied species have agonistic character, but none of them shows a visible domination over another. If competitive interactions among bank voles and striped-field mice take place, they have a character of exploitation; direct aggressive contacts are not the most important in competition.