Walter and Clay Pigeon are two pigeons who talk to Barnaby B. Busterfield III, whom they annoy. Walter is the male pigeon and Clay is the female. Neither of them manages to say complete sentences without each other's help. Walter is performed by Tim Lagasse and James Kroupa, while Clay is performed by Heather Asch.
For a while, they disappeared after Episode 70: Dance In Smarty Pants, but in Episode 117: The Popcorn Popper/Oh, Yes, it Can!, they came back. It also happened to be their last appearance.