In this outstanding work made in collaboration with 36 researchers from Iceland, UK, USA, Finland, Norway, Denmark, Australia, Sweden, Austria, The Netherlands, Canada, France, Russia and Germany we show the effects of rodents, birds and ungulates on different processes, functions, and properties of tundra ecosystems. This systematic review underscores the importance of herbivore diversity in shaping the structure and function of Arctic ecosystems, with different functional groups of herbivores exerting additive or compensatory effects that can be modulated by environmental conditions.