The scope of the research presented in Acta Theriologica is wide. It covers all aspects of wild mammal biology, including genetics, ecology, behaviour, bioenergetics, morphology, development, reproduction, nutrition, physiology, palaeontology and evolution. Special issues of our journal were devoted to ecology of the bank vole, ecological genetics of mammals, developmental homeostasis, evolution of shrews and population dynamics of small mammals. Some species found a special place in Acta, among them the European bison, which was the main subject of more than 120 papers that were published in the series Bisoniana. During its long history, the main focus of the journal has changed from morphology, bioenergetics, population dynamics and genetics to ecology and evolution of mammals. From the beginning, all the main groups of mammals have been represented in its pages, although special attention has been given to insectivores, rodents, ungulates and carnivores.