The oldest known animal in the world was 'Ming' the 405 year old clam, discovered in 2007.
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Lurch, a Watusi bull, had the largest horns in the world.
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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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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.
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Meysi is one of the world's smallest dogs, measuring in at just 7cm tall, 12cm long, and weighing a meagre 250 grams (only slightly heavier than a hamster!)
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Rattlesnake mating sessions have been known to last more than 22 hours.
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