This dataset contains the Luxembourg occurence records from 2020 to 2022 of the national monitoring using hair traps with valerian, in forest, targeting Felis silvestris silvestris, Martes martes and Mustela putorius. Selection of 72 1km-squares with >10% of forest coverage using a stratified random sampling. 3 camera traps on game routes, 1 camera trap on Polecat habitats (pond and/or river bank and/or forest edge), from January to June, control every 2 weeks for hair collecting and systematic hair trap replacement (execpt for the "Polecat" site). 3-year cycles (surveys undertaken every years on 1/3 of the squares, in rotation). https://www.list.lu/en/environment/project/forest-mammals/Data have been standardized to Darwin Core using the camtrapdp R package and only include observations (and associated media) of animals. Excluded are records that document blank or unclassified media vehicles and observations of humans.