The most expensive cow in the world was sold in 2009 for $1.2 million.
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Honeypot ants are a unique insect that use their own bodies as living storage pots of honey.
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Bats sleep 18-20 hours per day.
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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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Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
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A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
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In 2011, a male tiger in India adopted a litter of orphaned cubs, taking on the role of ‘mother’. Wildlife officials say such behavior had never been observed before.
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