Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
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Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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Cats and dogs can hear ultrasound.
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It has been scientifically proven that stroking a cat can lower one's blood pressure!
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There was a bear called Wojtek who was adopted by Polish soldiers during WW2. It carried ammunition, wrestled with soldiers, and drank beer.
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Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
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The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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