Our hypothesis that the exoanthropic forest rodent species (e.g. bank voles) avoid the urinary odor of the synanthropic house mice was tested in field experiments in August 2016. One count of small mammals was carried out in each of two 4-ha fields by the capture-mark-recapture technique during 12 days. 200 live traps (100 points, 2 traps per point) were exposed and controlled twice a day (early in the morning and in the evening) in each count.