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The ocean is home to the biggest animals on Earth. Test what you know about blue whales, whale sharks, orcas, narwhals, giant squid and more in 10 quick questions.
1. What is the largest animal known to have ever lived?
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Blue whale. Blue whales can grow to about 30 metres long, larger than any dinosaur.
2. What is the largest fish in the sea?
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Whale shark. The whale shark is a fish. The blue whale is a mammal.
3. What does the giant whale shark mostly eat?
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Plankton and small fish. Whale sharks are filter feeders that swim with their huge mouths open.
4. How do whales breathe?
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Through a blowhole on top of the head. Whales are mammals, so they surface to breathe air through their blowholes.
5. The killer whale, or orca, is actually the largest type of which animal?
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Dolphin. Orcas belong to the dolphin family, and they are its largest members.
6. Which is the largest turtle in the world?
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Leatherback sea turtle. Leatherbacks can be over 2 metres long and dive very deep.
7. Which whale has a long, spiral tusk?
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Narwhal. The narwhal's tusk is actually a long tooth that grows through its upper lip.
8. Which whale is famous for its long, complex songs?
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Humpback whale. Male humpback whales sing songs that can last for many minutes and change over the years.
9. How many hearts does an octopus have?
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Three. Two hearts pump blood to the gills, and the third pumps it around the body.
10. Which deep-sea animal has some of the largest eyes in the animal kingdom?
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Giant squid. A giant squid's eyes can be as large as a dinner plate, helping it see in the dark deep sea.
