It has been scientifically proven that stroking a cat can lower one's blood pressure!
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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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Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
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In Australia, there are spiders big enough to eat snakes.
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In 2011, a male tiger in India adopted a litter of orphaned cubs, taking on the role of ‘mother’. Wildlife officials say such behavior had never been observed before.
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A group of kittens is called a "kindle".
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