Invasive species have made their way into more than half of the national parks in the Untied States which is terrible news for native species. Efforts to stop them are lacking and without intervention, the problem will only get worse.
Read MoreInvasive species have made their way into more than half of the national parks in the Untied States which is terrible news for native species. Efforts to stop them are lacking and without intervention, the problem will only get worse.
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