Share a family meal with our prairie dog colony. #NatZooZen . . . Grasses and leafy vegetation make up 98% of the prairie dogs’ diet. As such, their food provides all of the moisture content that they need—they don’t need to drink water. The Zoo’s animals nosh on leafy greens, root vegetables, herbivore pellets, hay and grass. | Smithsonian’s National Zoo and Conservation Biology Institute