And the answer is. . .

Congratulations Amy, you were the first one to guess correctly!

Yes, it’s a squirrel!

I noticed him (her?) when I went out to our mailbox one morning, sitting on a big limb in the oak tree at the end of our driveway.  It was calling and calling and calling.  And here I used to think I was hearing birds when I heard that sound!

I tried several times to get a good picture of this squirrel, but he was far up in the tree in deep shadow with bright light behind.  The picture above was the best I could do!

My thanks to those who participated in this little contest.  Stay tuned, because I plan to have more sometime!