Ethological strategies of adaptation of two microtine species in the anthropic landscape. The paper studies the behaviour of the twin species of microtine and their adaptive potential. The individuals that colonize cereal crops in winter reproduce and survive better than those that remain on the fields with perennial grasses after the peak phase. In summer, once the wheat is ripe, independent of their density, the individuals spread on forage crops fields, as well as on the fields with corn, beet, etc., that are not typical of microtine. Thus, the majority of migrants stops reproducing and are, consequently, eliminated.