CERATOSAURUS This Jurassic theropod dinosaur was a big creature, growing to as long as 20 feet. Found in North America, Europe, Asia, and Africa, it belongs to a family called the "horned lizards" (Ceratosauridae). It had strong arms that ended in four-fingered hands, indicating that it was a primitive dinosaur. Another interesting feature of this dinosaur was its fused hip and foot bones similar to those found in birds.