It is a large theropod carnivorous dinosaur that lived in northern Africa during the mid Cretaceous period, famous for its unique sail like dorsal spine and body shape adapted to aquatic life. It is one of the largest known carnivorous dinosaurs. The head is long and narrow, similar to modern crocodiles, with straight conical teeth that lack serrated edges and are suitable for hunting fish. The dorsal nerve spines are very tall, forming unique sail like structures that may be used to regulate body temperature, attract the opposite sex, threaten opponents, or attract prey. The living environment includes wetlands such as rivers, lakes, and swamps, and is active on land and near water, preying on fish and other aquatic animals.