A recent study by biologists at the Arizona Game and Fish Department found that non-native, feral burros are having a negative impact on some keystone plant species in Arizona’s Sonoran Desert landscape. These changes in habitat are reportedly already harming species of wildlife and may pose a challenge to more species in the future.

"For a number of years in areas with burros, our biologists anecdotally observed trees that were over-browsed and that had ripped bark and branches,” said Clay Crowder, AZGFD assistant director, Wildlife Management Division. ×

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