To answer that, we need to be specific about which creatures. The ocean is a vast and diverse place with all sorts of animals, from tiny plankton to enormous whales. Here are some examples:
* Plankton: These microscopic organisms are the base of the food chain and are eaten by many animals.
* Fish: Fish eat a variety of things, depending on their size and species. Some eat plankton, others eat smaller fish, and some even eat seaweed.
* Whales: Whales are filter feeders, meaning they strain large amounts of water through baleen plates in their mouths to catch tiny organisms like krill.
* Sharks: Most sharks are carnivores and eat fish, seals, and other marine animals.
* Sea turtles: Sea turtles are herbivores and eat seagrass and algae.
* Seabirds: Seabirds like penguins and albatrosses eat fish, squid, and other marine animals.
So, the answer to what sea creatures eat depends on which creature you're talking about.
Do you have a specific animal in mind?