Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
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The Caspian Sea is also classed as the world's largest lake.
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Rafflesia Arnoldii is the largest flower in the world and can grow as big as an umbrella.
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The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
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The world’s largest frog, the Goliath frog, can grow over 13 inches in length and can jump up to 10 feet in a single bound.
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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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