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"“Cougar predation appears to rewire an ancient food web, with diverse implications for modern ecosystems,” they wrote in their study published in the Journal of Animal Ecology. “Our results suggest that protecting apex predators could have important implications for the ecological effects of introduced megafauna.”
Other recent research published in the Journal of Wildlife has documented cougars preying on feral horses in the Great Basin. But even there, they found cougars were unlikely to remove enough horses to reduce their damage to the arid landscape." - Wildlife: Do Cougars Affect Ecosystems by Preying on Feral Donkeys
"Invasive burros, Equua asinus, are often called donkeys and can be found throughout the backcountry in Death Valley. They are an introduced species that originally descended from the African wild ass and are NOT native to North America. This means that Death Valley did not always have burros present. Invasive burro populations grow at approximately 20% per year. These nonnative animals cause damage to native vegetation, spring ecosystems and compete with native wildlife, such as bighorn sheep and desert tortoise, for limited resources." - National Parks Service: Invasive Burros