About 1 month ago we started smelling something bad in our 1/2 bath on the main floor. Last week Les turned on the fan and squirrel fur came of the vent. Come to find out Leslie is deathly allergic to squirrel (after cleaning up the mess she had her typical melt down like being around cats). It was a flying squirrel which flew across from one of the big trees and crawled into our vent duct, which is isolated about 15 feet off the ground in the middle of the brick siding on our house. She made a nest and had babies about 6 weeks ago. They didn't make any noise until last week. A critter service set a trap outside the vent (one way in, no way out). The mom was trapped on Saturday night but didn't make it through the night. This morning there were 5 babies, still alive in the trap. We hope that's all of them. They are going to let them go in the woods somewhere (not near here).