Tillie is a friendly neighborhood duck with a wonderful sense of humor and lots of friends. Tillie is so much fun to be around, that her friends are constantly dropping by her place for impromptu play-dates. Tillie loves when that happens, because then she can play her favorite game in the whole world - guessing who's knocking on her door! As young viewers listen and play along, "Tillie Knock-Knock" introduces them to animal names and the sounds they make.