I use to have several back when I lived in the south Paducah Kentucky that is and when I still had my country and primitive kitchen where I live now. I have sold them all except this little spongeware pie bird. You set them in the middle of your pie and as the pie bakes the steam comes out the pie birds mouth.
I even used them once in a blackberry pie.I had a friend visit not long ago talking about a blueberry pie and I found a recipe in one of my Mom's old cookbooks. I just might have to use this little guy again. I think as far back as 1940's they were a special item to have in your kitchen
Do you have a pie bird? most common ones were the little black birds, my Great Aunt had one when I first discovered such a thing. That's what great about being young and discovering all the old kitchen items our families use to use and now they are just pretty collectables.