- A group of rats is called a mischief
- Rats have no tonsils and no gall bladder
- Rats are actually allergic to cheese
- A male rat is called a buck
- The rat is the first symbol in the Chinese zodiac
- The gestation period of a rat is 21 days
- Rats can last longer without water than a camel
- Research at the University of Wisconsin in 1998 showed that rats were mentally stimulated by classical music
- Rats are the first to desert a sinking ship. When sailing vessels were made of wood, rats nested in the hold and were the first to know if a leak had developed
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