Under the Sea

The Secret Lives of Sea Creatures

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Jellyfish

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Jellyfish have drifted along on ocean currents for millions of years, even before dinosaurs lived on the Earth. The jellylike creatures pulse along on ocean currents and are abundant in cold and warm ocean water, in deep water, and along coastlines. But despite their name, jellyfish aren't actually fish—they're invertebrates, or animals with no backbones.

Turtle

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Green sea turtles are the world’s largest species of hard-shelled sea turtle. While most individuals weigh about 300 to 400 pounds (136 to 181 kilograms), some can be as heavy as 440 pounds (204 kilograms).

Shark

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Green sea turtles are the world’s largest species of hard-shelled sea turtle. While most individuals weigh about 300 to 400 pounds (136 to 181 kilograms), some can be as heavy as 440 pounds (204 kilograms).

Penguin

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Crossing a beach to get to the sea, a two-foot-tall Humboldt penguin waddles over what appears to be a cluster of large boulders. Suddenly one of the rock-like objects rises up and barks! The penguin is stepping on sea lions lounging on the shore. Sea lions prey on Humboldt penguins in water but are too slow to catch them on land. The bird continues to ruffle feathers as it climbs over more annoyed sea lions. But it finally makes it to the ocean and dives in for a swim.