LOS ANGELES, CA.- The Natural History Museum of Los Angeles County (NHM) opened its all-new, 14,000-square-foot Dinosaur Hall, marking the halfway point of the Museum’s seven-year transformation. Twice the size of the Museum’s old dinosaur galleries, the new permanent exhibition features over 300 fossils and 20 complete mounts of dinosaurs and sea creatures. The hall rivals the world’s leading dinosaur halls for the number of individual fossils displayed, the size and spectacular character of the major mounts, including the world’s only Tyrannosaurus rex growth series, and the accessible integration of recent scientific discoveries and research into the displays.