The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
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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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The largest earthworm on record was found in South Africa and measured 22 feet.
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