The most expensive cow in the world was sold in 2009 for $1.2 million.
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Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
The oldest known animal in the world was 'Ming' the 405 year old clam, discovered in 2007.
492
The elephant brain weighs about 6,000g.
274
When Koko, the gorilla famous for knowing sign language, was asked where gorillas go after death, she responded by signing “Comfortable hole, bye.”
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