Spinosaurus was well-adapted to a diet focused on fish, thanks to its narrow snout and distinctive notch near the front of its jaws, which were perfect for gripping slippery prey. It likely hunted a variety of aquatic creatures in its river system, including coelacanths, sawfish, large lungfish, and sharks.

This image highlights Spinosaurus's diverse feeding habits, as evidence from the Santana Formation in Brazil suggests that a member of its family scavenged on pterosaurs. A notable find includes a Spinosauridae tooth lodged into the vertebra of a pterosaur, suggesting that members of this family were not picky eaters and likely scavenged when the opportunity arose. This discovery indicates that, beyond its primary diet of fish, Spinosaurus could also feed on terrestrial or aerial animals, whether through hunting or scavenging, further illustrating its adaptability in its ecosystem.