The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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Sheep, goats, octopuses, and toads have rectangular pupils.
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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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Tigers can see 6 times better at night than humans.
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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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Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
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