The study looked at how livestock grazing has affected grasslands in Mexico over the past 500 years. They found that different animals like cattle, sheep, and goats have grazed on the grasslands at different times, leading to changes in the types of grasses and plants found there. Overgrazing has harmed the grasslands and impacted the animals and plants that live there. The researchers suggest that by focusing on specific grasses like buffalo grass and blue gramma, the grasslands can be improved to support both livestock and wildlife.