http://www.amazon.com/Guide-Night-So.../dp/0811731642
Near the bottom of this page from Amazon are several other suggested books, some with CD's, of the sounds.
We live along the Gunstock River and during the summer with windows open the woods behind the house are full of sounds.
Check this website. Seems lots of folks have recorded and posted animal sounds. The site doesn't seem to be well maintained, (lots of dead links), but maybe you'll get lucky.
http://www.members.tripod.com/Thryom...malSounds.html
There is also this site, easier to navigate.
http://www.soundboard.com/sb/Nocturn...al_Sounds.aspx
One last site. You need to d/l the files, but they have lot's of files:
http://www.a1freesoundeffects.com/animal.html
Good Luck!