Abstract
A comparative analysis of reproductive behavior has been performed in the steppe lemming (Lagurus lagurus) and narrowskulled vole ( Microtus gregalis). The results show that the species are similar in certain behavioral features indicative of the stability of mating pairs. However, in the narrowskulled vole, unlike in the steppe lemming, mature males in olfactory tests show preference for receptive sibling females versus nonkin females. Probably, it is the absence of the incest taboo that allows the involvement of young of the year in reproduction within growing family groups and accounts for "coloniality" of the species.
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