What do underwater dinosaurs eat?

Underwater dinosaurs, or more accurately, marine reptiles like plesiOSaurs and ichthyosaurs, primarily fed on a diet of fish, squid, and other marine organisms. Their sharp teeth and streamlined bodies were well-adapted for catching and consuming prey in the ocean. Some larger species may have also hunted smaller marine reptiles or scavenged carcasses. Overall, their diet varied based on their size, habitat, and available prey.