Thirty rats found Saturday behind Western Heights Middle School are at Humane Society of Washington County. They are not currently available for adoption. (Katherine Cooker/Humane Society of Washington County)

Then again, there’s Michael Jackson’s ode to a pet rat, Ben.

Thirty rats found over the weekend on the grounds of Western Heights Middle School in Hagerstown, Md. belonged in the second category.

Principal Stephen Tarason said someone apparently dumped the rats on the school grounds or in the nearby woods. They are clearly pets; they even come when called.

Tarason says the building manager who found the rats told him they were huddled under a pine tree in an area that is not used as a playground.

The Humane Society of Washington County says they are domesticated animals — and they make wonderful pets. But that doesn’t mean they are welcome in the cafeteria.