On the campus of the University of Florida, the state's official museum of natural history and the largest natural-history museum in the Southeast has holdings of more than 40 million objects and specimens. In addition to active collections in anthropology, archaeology, botany, mammalogy, and ornithology, the museum features several interesting replicas, including nearly complete fossil skeletons of a mastodon and mammoth from the last ice age as well as a full-size model of a Florida cave and mangrove forest. The Butterfly Rainforest houses 60 to 80 species in a 6,400-square-foot, screened, free-flight vivarium. Butterfly releases take place weekdays at 2, and weekends at 2, 3, and 4, weather permitting. The museum has changing temporary exhibits; kids eight and under will love Discovery Room, featuring interactive exhibits, a reading corner, and a building area.