I bet you've seen a cat lick its fur to clean and groom itself. Some of the hairs come off and are swallowed. Eventually, this swallowed fur forms a ball in the cat's gut and she will vomit this disgusting thing up with some difficulty and leave it for you to find (ick!).
In the same way, the park officials must deal with this disagreeable issue and come up with a solution that is the least objectionable to the most people.
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