* Seabirds: Albatrosses, petrels, shearwaters, and gulls are all tertiary consumers that live in the ocean. They feed on fish, squid, and other marine animals.
* Sharks: Sharks are apex predators that occupy the highest trophic level in the marine ecosystem. They feed on fish, seals, sea lions, and other marine animals.
* Tuna: Tuna are large, predatory fish that feed on smaller fish, squid, and other marine animals.
* Swordfish: Swordfish are large, predatory fish that feed on smaller fish, squid, and other marine animals.
* Marlin: Marlin are large, predatory fish that feed on smaller fish, squid, and other marine animals.