Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
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Early American humans hunted car-size armadillos and used their shells for houses.
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The Pistol Shrimp can snap its claws together to create a sound of 218 decibels, louder than as supersonic jet at full speed. It only lasts for 1 millisecond. The snapping action also creates a bubble that is greater than 5000 Kelvin, close to the surface temperature of the sun.
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Meysi is one of the world's smallest dogs, measuring in at just 7cm tall, 12cm long, and weighing a meagre 250 grams (only slightly heavier than a hamster!)
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Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
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The Basenji dog is the only dog that is not able to bark.
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In order to enhance the taste, Japanese macaque wash their food in salt water before they eat. They also make snowballs for fun!
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The reindeer is the only mammal that can see UV light.
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