Webster's a little duck-or is he? He certainly looks like a duck, with webbed feet, a bill, and downy feathers. He likes to eat the things ducks eat, especially earthworms and grass. He quacks like a duck, and all his brothers and sisters are ducks, so he must be a duck too, right?

Webster doesn't think so. Ducks are supposed to love water, but he's not a very good swimmer. He swims so badly other ducks tease him about it.

If he's not a duck, then what is he? Webster decides to find out. So with his mother's permission (and a packed lunch) Webster sets out to discover what...