OMFG!!! Those sounds are ****ing scary... My great Dane is sitting next to me currently and is very disturbed by this. However, this explains the sound I heard about a year ago in the back of our place, during the night. I had my window open because it was during the summer (there was a screen on it, and we have a deck that is elevated about 6 feet off the ground), and I heard what sounded like an animal killing another animal. It sounded just like some of those growls, it must have been a bobcat killing a smaller animal. Who knew such a big sound could come out of a fairly small cat.