Animals housed in a cage with clustered environmental enrichments may deal with higher aggression when they have to
compete for depleting resources. In this study, the effects of the way environmental enrichments distributed between
individuals were investigated. Sixteen adult male mice (Mus musculus) were housed in four different treatments with
manipulation in terms of food choices availability and distribution of resources. Each male was observed for their
aggressive and stereotypic behaviours for seven minutes twice a day for five days. The faeces were also collected after each
treatment for measuring the corticosterone level in order to indicate the stress level of the mice. The results showed reduced
aggression (p