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A hawksbill sea turtle searches Sipidan reef looking for sponges to eat.  Sponges are toxic and full of glassy shards, but the turtle is built to digest them.

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The oceans of our planet are ruthless battlefields that constantly test even the deadliest carnivores. Dive beneath the icy waves of Alaska's Aleutian Islands to witness a hunting technique rarely, if ever, documented amongst killer whales. Further south, the fastest fish in the ocean, the sailfish, corrals sardines into a giant bait ball in the Gulf of Mexico. Along the Pacific Coast, the Pacific torpedo ray stuns potential prey with a strong jolt of electricity.

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