Spinosaurus is a large carnivorous dinosaur that lived during the Cretaceous period. It is known for its distinctive sail-like structure on its back, composed of elongated spines. With its long snout and sharp teeth, Spinosaurus was well-adapted for catching and eating fish, indicating a semi-aquatic lifestyle. This dinosaur is considered one of the largest theropods ever discovered, reaching lengths of up to 50 feet (15 meters) and weighing several tons. Its name, "Spinosaurus," translates to "spine lizard," referencing the prominent spines along its back.