Elly, an ankylosaurus, wins a waddling race against her brothers. She discovers that unlike her family, she has a clubbed tail. During a game of hide and seek, Elly meets Aargh, a deinonychus. Elly's enthusiastic tail wagging repeatedly knocks Aargh into unpleasant situations like thorns and mud. Elly mistakes their interactions as games and encourages Aargh's escapes by continuing to wag her tail. Aargh eventually flees and Elly looks forward to playing with him again, unaware of the harm her tail causes.