Muskrat
Ondatra zibethicus
Description This semiaquatic rodent looks like a small beaver, but with a tail that’s round and not flattened.
Habitat North branch of Chicago River and anywhere near large ponds. In early morning, look for a small wake and the top of their little heads as they swim along.
Notes While its fur is also very soft, muskrat attire doesn’t carry the cachet of beaver. “It was often considered the poor person’s pelt,” Brown explains.
I LOVE POSSUMS!!!!
The nests you are seeing are not in Rosemont, they are off of 90 in Busse Woods near Arlington Heights, and they are mostly Great Blue Herons along with a few other species.
Bats aren't rodents.
This Place is a Zoo -- Big Brown Bat...Did your writer really think that bats are rodents? They are mammals and are closer related to humans genetically than they are to mice. I could see if there was a ha ha in the little write-up after it says flying rodents, but looks like he/she was serious. I think if Larry Heaney, who is quoted in the article, ever sees this he'll be pretty ashamed and upset to be associated with such a misconception.
I have often noticed a rookery of nests close to Rosemount, IL. Does anyone know if these are eagles or a type of heron?