Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
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Using a remote-controlled camera, biologists caught dolphins getting high by sucking on puffer fish. They were even caught passing the puffer fish around.
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In Australia, there are spiders big enough to eat snakes.
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The Basenji dog is the only dog that is not able to bark.
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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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