What Floats in a Moat? (Harper Collins Publishers)

Archie the Goat has several barrels of buttermilk that the queen needs, but in order to get them to her, he needs to cross the moat. Testing several different theories to find out what will float and what will sink, Archie and his friend Skinny the Hen don't succeed at first, but they do try, try, try again (and again). Full color.