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A skeleton of a Gorgosaurus dinosaur is going up for auction for the first time and is expected to fetch between $5 million and $8 million. The auction house will put the specimen, which is 10 feet tall (three meters) and 22 feet long, under the hammer in New York on July 28. Sotheby's described the skeleton as "one of the most valuable dinosaurs to ever appear on the market. The Gorgosaurus roamed the earth approximately 77 million years ago. A typical adult weighed about two tonnes, slightly smaller than its more famous relative, the Tyrannosaurus rex. Paleontologists say it was fiercer and faster than the T-Rex, with a stronger bite of around 42,000 newtons compared to 35,000. The skeleton was discovered in the Judith River Formation near Havre, in the US state of Montana in 2018. The sale will mark the first time that Sotheby's has auctioned a full dinosaur skeleton since it sold Sue the T-Rex in 1997 for $8.36 million.