I recall a news item from a few years back: the inhabitants of a mink farm -- don't recall how many, exactly, but more than a couple hundred of them -- escaped into the wild, and the locals were...
a bit distressed* for a few days until most of them could be rounded up.
Edit: The incident of which I was thinking was in southern England, iirc, but
here's an item about a more recent (and larger) incident in Germany.
* passing hexahedral units of masonry