Each puzzle comes with an educational Madd Capp Fun Facts booklet. On one side is a fold-out puzzle image to hang as a poster or use as a reference. On the flipside is a wealth of amazing facts. Did you know, for instance, that ducks can waddle over snow and swim in frigid water and their feet won't freeze? Blood circulates through them in a "countercurrent," so even though duck feet aren't insulated with fat or feathers, their toes stay toasty!