Wildlife: The Ultimate Challenge

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1. Which small marine crustacean, the mantis shrimp, has claws that strike fast enough to create cavitation and light?
2. Which African freshwater fish can breathe atmospheric air and survive several months buried in dried mud?
3. Which Arctic marine mammal, related to the narwhal, communicates through a wide range of sounds and is sometimes called the 'canary of the sea'?

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