Do You Know Who Drew These Adorable Critters?

Several weeks ago Shirley Baustian received an envelope with the below artwork in it. The envelope was mailed from the Whitehall Post Office to Baustian's PO Box. No name was given, nor a return address.

The drawings depict two owls, named Hoot and Holler, and their friends, a duck and a hedgehog. The below picture says: "Hi! My name is Hoot that is my big brother Holler and he does a lot of stuff. We live in this place with lots of old people. I know there is a big world out there. Holler says that is only in books. So I had this old lady send us to you so you can put us in a book and I can s...