Australia-based scientists have found the world's largest dinosaur footprints ever recorded among 21 kinds on a 25-km-long coastline now dubbed as "Australia's Jurassic Park". Up to 1.7-metre-long footprints believed to belong to long-necked sauropods existing 140 million years ago, were discovered. The four-legged sauropod is considered one of the largest dinosaurs to have lived on Earth.