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Oklahoma has been exemplary at cleaning up its streams. By some measures, more than any other state.
A big part of the solution was simple: Give cows clean drinking water and keep them out of the streams.
When one farmer tried it, he quickly saw results. His veterinarian bills went down and wildlife returned to the area.
Read more What Helped Clean Up Oklahoma Waters? Getting Cows to Use a Different Washroom
Natural History Wanderings 
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