New York museum unveils newest fossil find br br The American Museum of Natural History reveals the identity of its latest resident on Dec. 5, 2024 - 'Apex,' one of the most complete specimens of the spiny-backed dinosaur known as a stegosaurus ever discovered. To excited gasps from an audience of school children, the museum pulled back a beige curtain to reveal the 11-foot (3.4-m) tall, 20-foot (6-m) long skeleton. The Stegosaurus was a herbivorous dinosaur that walked on four legs and lived around 150 million years ago, during the Jurassic period. The fossil was found in Colorado and fetched a record $44.6 million at a Sotheby's auction in July. The buyer has loaned it out to the New York museum, popular with tourists and school children.