Several nights lately something has been making a noise that I have never heard before. It is usually around 3 AM & it's loud enough to wake me up. At first, I thought it was a bird, but now I'm starting to think it might be some kind of cat. It's kind of a warbling moan that starts out loud, then a few not so loud. It does this 3 or 4 times, then stops & I won't hear it again that night. It doesn't sound like a cougar---but maybe a bobcat? Any ideas? It's getting a little spookey.