Dogs sometimes fake being sick to get attention.
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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 most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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By putting a frog in a bucket of milk, scientists following up on an ancient Russian way of keeping milk from going sour have identified a wealth of new antibiotic substances.
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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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