Sniff, sniff! went Mouse. Whiff, whiff! went Mouse. Who left this poo outside my house? I must undo this mystery. Poo-dunit? Mouse is dismayed to step outside her house one morning only to discover a giant pile of poo! Who could have done such a dastardly deed? Mouse questions all the animals of the forest, but its too big to be Squirrels, too dark to be Coyotes, and too messy to be Deers. Will Mouse ever track down the culpritand will she find a way to make the best of this smelly situation? Between giggles at every mention of the word poo, children will learn to identify eight different animals scat and discover how droppings can help plants to grow, all while enjoying Katelyn Aronsons rhyming text and Stephanie Laberiss expressive animals. Back matter includes a mini poo-dunit mystery challenging children to match scat with the correct animal, as well as a note on why poo is preciousand who is responsible for the biggest poo of all.