The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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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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When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
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A cat rubs against people not only to be affectionate but also to mark out its territory with scent glands around its face. The tail area and paws also carry the cat's scent.
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The male seahorse carries babies and 'gives birth' to them instead of the female.
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The ancestor of all domestic cats is the African Wild Cat which still exists today.
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