Squirrel Sounds

I just added some sounds to my recording of squirrels at
http://www.birdblind.org/squirrel.m3u
At the end, you can hear two of them chattering after they knocked my bird feeder off the shed.

New Mystery Sound

Something’s been savaging my bird feeder. Here’s one of the sounds it made. http://www.birdblind.org/sound01.mp3
I’m almost positive I know what it is, and this certainly isn’t the sound it usually makes. I am open to your thoughts on what it is.