The study found that in dryland conservation reserves in Australia, grazing by kangaroos and rabbits is harming vegetation and soil health. Kangaroos are the main herbivores in these reserves, and their grazing is leading to reduced plant diversity, soil depletion, and soil compaction. This overgrazing is jeopardizing conservation efforts in the region. The researchers used driving transects and dung surveys to assess herbivore abundance and selective exclosures to measure their impact on the environment. The study highlights the importance of managing wild herbivore populations to prevent overgrazing in conservation reserves.