More than of the museum's is dedicated to exhibits. There are chronological galleries celebrating the 3.9 billion year history of life on Earth. One of the most popular is "Dinosaur Hall", with almost 40 mounted dinosaur skeletons, including specimens of "Tyrannosaurus rex" and "Albertosaurus". Other exhibits include "Lords of the Land"; "Burgess Shale"; "Devonian Reef", a life-size model of a 375 million year old reef; a "Cretaceous Garden", with over 600 living species of plants; "Age of Mammals"; and "Ice Ages".