The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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If a vampire bat goes 2 days without drinking blood, they can die. However, well fed female bats will puke up blood and share it with other bats that they like in exchange for grooming.
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The elephant brain weighs about 6,000g.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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