What help spinosaurs stay alive?

Answer 1

Spinosaurus was a fish eater, or piscivore, and adaptations for fishing include its long, narrow jaws and non-serrated, interlocking teeth. Spinosaurus may have even had pressure sensors in their jaws for detecting fish in the water even if they couldn't see the fish. The enormous size of Spinosaurus, at 49 feet in length, would have made them intimidating to other dinosaurs. Of course the spectacular sail of Spinosaurus was an adaptation. It may have been used to either cool or heat the Spinosaurus, to attract mates, or to intimidate rivals.