Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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Early American humans hunted car-size armadillos and used their shells for houses.
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Cats recognise the voice of their owner, but never evolved to care.
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The most expensive cow in the world was sold in 2009 for $1.2 million.
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Allegedly, Chrysippus, the Greek philosopher, died of laughter after getting his donkey drunk and watching it try to eat figs.
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Sheep, goats, octopuses, and toads have rectangular pupils.
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Sergeant Stubby was the only war dog to be promoted to sergeant through combat in WWI. He saved his regiment from surprise mustard gas attacks, found and comforted the wounded, and even once caught a German spy by the seat of his pants, holding him there until American Soldiers found him.
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