Weird Animal Noise at Night?

I live in the pacific northwest and last night started hearing something last night in the backyard that sounded almost like a cat fight, but only with one cat. I couldn't see anything outside from the window, so I thought maybe it's some type of bird. Hearing it again the next night. Any idea of what kind of animal might be making this noise?
Answers

Laura

It could just be a cat. i would call animal control and let them know, because this is a new thing for your area. If there is an animal in a residential area that shouldn't be, they are the ones who get it out.