Certain octopus species are known for their intelligence.
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The Arctic Ocean is the smallest ocean.
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Dolphins give each other names — they use unique whistle signatures to identify individuals.
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Some whales communicate across vast distances underwater.
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Octopuses have been observed escaping aquariums, navigating floors, and entering other tanks to hunt for food.
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Many deep-sea animals lack strong pigmentation.
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Male seahorses carry and give birth to their young.
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Heart disease is the leading cause of death globally.
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Sea otters use rocks consistently as tools.
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