Herbivore diversity in its multiple forms (e.g. species richness, evenness, identity of dominant species, functional diversity), regulates the impacts of herbivores on plant communities and functioning of ecosystems. Herbivore species differ in their habitat preferences, food choices and feeding styles, leading to different impacts on ecosystem. TExNet uses a coordinated distributed experiment that manipulates herbivore diversity at multiple tundra sites. By excluding different sizes of herbivores from different tundra habitats, we will investigate their impact on tundra vegetation and ecosystem functions.