The Glass Flowers, the Great Mammal Hall's whale skeletons and the dinosaur gallery, with regular family classes and specimen-handling sessions.
Details change often — check with the program.
Harvard Museum of Natural History is listed in the GOkidOZ guide to museum classes and family tours across Massachusetts. Class schedules, free hours and vacation-week programmes change term by term — check the official site above for current listings, and see what else is on during winter break.