Since its discovery, Spinosaurus has been a contender for the longest and largest carnivorous theropod dinosaur, larger than the Tyrannosaurus, Giganotosaurus and Carcharodontosaurus. Estimates published based on complete specimens discoveries in 2014 and 2018, supported earlier research findings that Spinosaurus reached lengths of 15 to 16 m (49 to 52 ft) and weighing 6.4 to 7.5 tonnes.

The long and narrow skull, similar to that of a modern crocodilian is known to have eaten fish, and most scientists believe that it hunted both terrestrial and aquatic prey as further evidence suggests it lived both on land and in water, much like our modern crocodilians. The distinctive spines were long extensions of the vertebrae which grew to 1.65 me (5.4 ft) and likely to have had skin connecting these to form the famous and most recognisable distinction to any dinosaur to date, the sail, a structure which some scientists believe may have also been covered in fat forming more depths to the sails and that they may have had multiple functions based on such a structure, including thermoregulation as well as display.

Genus: Spinosaurus aegyptiacus. Dinosauria, Theropoda, Spinosauridae.
Origin: Tegana, Province 'De Ksar-es-Souk', Kem Kem, Morocco, N. Africa.
Age: Mesozoic era, Cretaceous, 112,000,000 - 93,500,000 years.