Cows can sleep standing up, but they can only dream lying down.
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The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
2
There's a rare breed of pig that looks like a sheep.
14
An alligator can go through 2,000 to 3,000 teeth in a lifetime.
268
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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