[Cheapskate]

I've heard of mice but haven't heard of squirrels and the plague

Besides , I think the plague comes from the fleas doesn't it?

[Calvin Locke]

A quick search yielded:

National Park Service Public Health Program - Bubonic Plague Factsheet...prairie dogs, wood rats, chipmunks, and other ground squirrels and their fleas, suffer plague ...

And, Denver is suffering a spate of squirrel deaths that have tested positive for the plague this year.