Laboratories \ Laboratory for behavior and behavior ecology of mammals \ Goals and Tasks . ... It was shown that in non-crossing in nature sympatric species of house mouse of the superspecies complex of Mus musculus s.l. , pre-copulative reproduction isolation was provided by its multiple duplicating at different levels of organization: the level of olfactory receptors, behavior of separate individuals in response to olfactory signals, pair interactions of potential sexual partners (Kotenkova E.V.). ...