I was down at my friends Brendan and Grace's when we heard this sound. Nobody knew what it was. To me it sounded somewhere between a cat and a baby crying. Someone suggested maybe it was a bird. Their daughter Mary said it was and pointed up a tree. After a bit we heard it again and heard something pounding on a birch tree. Mystery solved. We spotted this red-breasted sap sucker. My bird book says these guys are shy birds. There was nothing shy about this one. He let us watch him from less than 10 feet away. Just going about his business. Every once in awhile he would fly away but a few minutes later he was right back where he was pounding on the birch tree.