The Osaka Museum of Natural History displays fully reconstructed skeletons of ancient animals, including dinosaurs and prehistoric mastodons, as well as lifelike models, dioramas, photographs, and panels showing the astonishing diversity of life on earth, and its even more astonishing evolution down through the ages. The museum is structured around a theme titled “The Relationship Between Humanity and Nature.” The museum staffs investigate and study different fields of natural history, and collect samples and reference books in order to present to Osaka citizens through permanent and special exhibitions. In addition, there are often natural history educational programs held both inside and outside the museum.