Illustration of Ulughbegsaurus uzbekistanensis. (Julius Csotonyi) NATURE T. Rex Wasn't Always at The Top of The Food Chain. Meet What Came Before author logo LAURA GEGGEL, LIVE SCIENCE 9 SEPTEMBER 2021 About 90 million years ago, a gigantic apex predator – a meat-eating dinosaur with serrated shark-like teeth – prowled what is now Uzbekistan, according to a new study of the behemoth's jawbone. The 26-foot-long (8 meters) beast weighed 2,200 pounds (1,000 kilograms), making it longer than an African elephant and heavier than a bison. Researchers named it Ulughbegsaurus uzbekistanensis, after Ulugh Beg, a 15th-century astronomer, mathematician, and sultan from...