Penguins have a gland above their eye that turns saltwater into freshwater.
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15% of snails survive digestion by birds and are found alive in their droppings, potentially leading to the spread of snail populations.
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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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Leonardo Da Vinci loved animals so much that he used to buy caged animals at the market just to set them free.
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The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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In 1918, a homing pigeon saved over 190 American soldiers by delivering a message to nearby support despite having been shot through the breast, blinded in one eye, covered in blood, and with a leg hanging on by just a tendon.
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