Stan Courtney has some audio recordings on his website. If you get a chance check it out here. Here are some samples:
Colorado Screamer
It was almost dark when I arrived at the site on Tuesday evening. I was concerned about driving down the rutted dirt road with my Toyota, not knowing for sure if I was at the correct location. So I drove back down the road and slept in my car at a small gravel pit. These sounds were picked up at 0330 a.m.
Illinois Screamer
A year and a half ago I recorded a series of very pitched screams here in Central Illinois.
This past week I have recorded what I think is similar screams. I also have a friend who lives about 1/2 mile from me. Just as it was getting dark he heard what he described as a very long loud high pitched scream. It was only about 75 yards from his back door and he did not investigate. He heard only one scream not a series. I emailed him my recording and he thinks it matches what I recorded.
Chatter
One of the biggest problems I faced for recording at my old place was hum from a treatment plant that was across the creek. Sometimes it was not heard but other times it was terrible. I recorded the following clip on the 13th of November of 2006.
Although this sound clip is not of very good quality it does show several things. This was at about 2 a.m. in a rural setting, so I know that no one was down in my woods. We also did not have any small dogs so I think the barking sounds are not of a dog. However the pattern of the barks does seem how my own dog barks, not the sounds but just the pattern.