The ‘Cage Climber’ - A new enrichment for use in large-dimensioned mouse facilities

•‘Cage Climbers’ resemble a biologically relevant environmental enrichment for male and female mice.•Mice are attracted by ‘Cage Climbers’ when exposed to them in a novel environment.•An elaborate behavioral test battery revealed no effects on data variability caused by ‘Cage Climbers’.•‘Cage Climbers’ constitute a new tool to increase animal welfare in large-scale mouse husbandry.