Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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A cow produces around 200,000 glasses of milk in her lifetime.
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The Basenji dog is the only dog that is not able to bark.
4
Cats lose almost as much fluid in the saliva while grooming themselves as they do through urination!
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Baks the blind boxer has a seeing eye goose named Buttons; a four-year-old goose who leads the pup around everywhere either by hanging onto him with her neck, or by honking to tell him which way to go.
16
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
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