(DC) (Smithsonian National Zoo) Waddle, jump, or hop on down to the Zoo! Join us for creative, drop-in play at the Zoo as we explore different plants and animals that live in and near ponds. Little Critters: Nature Play is designed for ages 0-5 and their caregivers and families. Activities are designed with early learners in mind, but all ages are welcome. Parents and guardians must remain with their children.