There is an animal that makes a lot of sound outside our house. I was able to narrow his location down the the bush he was in, and I recorded his sounds. I compared it to all the frog and toad sounds on this site and I think that it's a gray treefrog. Here's a recording of our frog:
He started competing with himself when I played his recording back to him. Anyway, hopefully one day I'll be able to spot the little guy. Apparently he's only an inch or two long.