Thanks for all of your replys. I have checked for animals and other related things, but I have not come across anything so far. We did have an air quality test done when we bought the home and one of the tests was in the attic. They did find a little bit of mold, but we had it remediated before we moved in. we also replace the old insulation at that time. And no chinese drywall. The house was built in the late 40's Today it's rainy and cool and I can not smell a thing in there. It baffles us.