Birtle and the purple turtles

"Everyone is a turtle in Turtletown. So Teeny thinks she must be a turtle, too. But when Teeny sprouts feathers, she begins to wonder . . . is there a teeny possibility she's a . . . BIRTLE? Tootie loves tag, but the other turtles in Turtletown don't like to play. That is, until Tootie meets Teeny. Teeny LOVES tag. They have tons in common! Except one BIG thing . . . Teeny may not be a turtle at all"--Provided by publisher.