Before the age of dinosaurs on land, the oceans were ruled by fearsome predators like the Dunkleosteus—an armored fish with a ...

These big deep sea creatures are filter feeders, eating over one ton of tiny crustaceans per day. 6. Humpback Whale Male humpback whales are known for their beautiful and haunting songs.

These sea snails are also voracious predators themselves and feast upon free-floating hydrozoans such as Velella velella and Portuguese man o' war. "They're small, but they're mighty," she said.