I work 3rd shift and get up @ 11PM. Tonight, at around 10:40 PM, I was awoken by a banging and clattering. As I got up, there was another short burst of the same accompanied by a metallic clanging... I made my way into the hallway and paused to listen. Shortly, It occurred again and I realized it was not coming from a window as in an attempted entry, but rather from beneath the house in the crawlspace. It seemed to be coming from beneath the bathroom just to my left. I entered the bathroom and banged on the wall and flushed the toilet. That, indeed, caused a commotion along with, I'm pretty certain, a hissing... At that point, I was thinking it was possibly a opossum. But why would a opossum be displaying such behavior, I wondered. Whatever it was, it seemed to be hung up by something and trying to escape. There was nothing to indicate a 2nd animal such as a predator that would cause crazed behavior by the one I was hearing. Female Cats will get under a house and up beneath bathtubs, hiding, or looking for a place to hide, kittens. But female Cats are not generally so stupid as to get hung up, or act without stealth and draw attention to themselves. Besides, this thing just had to be bigger and heavier and louder than a female cat... from my perspective, anyway! Anyway, I get dressed and by that time, the disturbance has ceased, but I get the rifle and flashlight and go out to check. None of the access point covers to the crawlspace had been disturbed. The gratings in the vent openings were all intact. I don't know how something as large and heavy as this critter sounded could have gotten in there... It's always something... Innit? I removed the cover to the access point that is right under the bathroom and left it open. There was insulation disturbed and hanging down in that area, but I'm pretty sure it was like that to begin with. Anyone care to speculate?