Geomagnetic field is for the living organisms a very significant biological factor, acting in time and space, indispensable in stimulating and steering of biological processes. So far domestic and laboratory animals kept in the conditions of naturally or artificially disturbed magnetic field were the objects of research on impact of geomagnetic field on the animals’ organisms. Therefore the study whether the state of geomagnetic field affected the choice of resting or breeding sites’ selection of free-living animals was undertaken. The fieldwork was carried out in the forests of Lutowiska Forest District in Podkarpacie Province in the south-east of Poland and Nawojowa Frest District in Małopolska Province in the south of Poland. Geomagnetic field in the resting and breeding sites of red deer, wild boar, badger, otter and fox was measured with geomagnetometer. The results allow us to conclude that free-living animals take into account geomagnetic field while selecting resting or nesting sites – red deer, wild boar and otter select places with undisturbed geomagnetic field while badgers’ dens are situated in the heterogenous geomagnetic field.

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