During the verification and reliability test of our new SPROMISE S308 game camera, a stone marten (Martes foina Erxleben, 1777) became the main actor at most of the night recordings. This little predator is undesirable visitor of domestic farms, where he can do fatal harm in a very short time. The same was true in this case, where he killed several individuals of helmeted guineafowl (Numida meleagris f. domestica) in couple of days.