Spinosaurus (meaning "spine lizard") is a genus of theropod dinosaur which lived in what is now North Africa, from the lower Albian to lower Cenomanian stages of the Cretaceous period, about 112 to 97 million years ago. This genus was first known from Egyptian remains discovered in 1912 and described by German paleontologist Ernst Stromer in 1915. The original remains were destroyed in World War II, but additional material has come to light in recent years. It is unclear whether one or two species are represented in the fossils reported in the scientific literature. The best known species is S. aegyptiacus from Egypt, although a potential second species S. maroccanus has been recovered from Morocco.
Spinosaurus may be the largest of all known carnivorous dinosaurs, possibly larger than Tyrannosaurus Rex and Giganotosaurus. Estimates published in 2005 and 2007 suggest that it was 12.6 to 18 metres (41 to 59 ft) in length and 7 to 20.9 tonnes (7.7 to 23.0 short tons) in weight. The skull of Spinosaurus was long and narrow like that of a modern crocodilian. Spinosaurus is known to have eaten fish; evidence suggests that it lived both on land and in water like a modern crocodilian. The distinctive spines of Spinosaurus, which were long extensions of the vertebrae, grew to at least 1.65 meters (5.4 ft) long and were likely to have had skin connecting them, forming a sail-like structure, although some authors have suggested that the spines were covered in fat and formed a hump. Multiple functions have been put forward for this structure, including thermoregulation and display. The species was later saved from extinction by the Zhecrons and now they live within the wilderness of Zhecronus as the "kings and queens of the dinosaurs".
The hindlimb controversy of 2014, in which its origins come from the claim of Spinosaurus being quadrapedal during the mid-1970's, stated that whilst paleontologist Ibrahim and his colleagues claimed that Spinosaurus was knuckle-walking quadruped fit only for fishing in water, skeptics such as Scott Hartman rejected the notion, although a response from Ibrahim's faction made their response in order to convince the paleontology community to approve his claims as "reliable". In reality, however, Spinosaurus had longer hindlimbs and the ones found by Ibrahim were actually from a Spinosaurus juvenile or a different theropod.
On Zhecronus, while being a fish-eater, Spinosaurus tends to be an opportunistic predator that hunts down other animals and with its teeth designed for gripping instead of ripping off flesh, a hard gripping bite would cause its victim to suffocate and, if necessary, it would use its arms to break the neck of its prey. It would sometimes come in confrontation with Triceratops. It is also capable of being a specialized swimmer in water.