Watch on YouTube: "Fox Screaming Eerie!!!" posted by smetlogik. I think this is the definitive answer to the "woman screaming" sound.
But I have also heard some other critter that's more like dog barking, but definitely NOT dog barking. MUCH creepier than this. I haven't found anything like it on the internet yet, but I'm still looking. Happy hangin'.
Mountains have a dreamy way
Of folding up a noisy day
In quiet covers, cool and gray.
---Leigh Buckner Hanes
Surely, God could have made a better way to sleep.
Surely, God never did.