A green cat was born in Denmark in 1995. Some people believe that high levels of copper in the water pipes nearby may have given his fur a verdigris effect.

A cat’s learning style is about the same as a 2- to 3-year-old child.

A cat’s purr vibrates at a frequency of 25 to 150 hertz, which is the same frequency at which muscles and bones repair themselves.

Cats don’t have an incest taboo, so they may choose to mate with their brothers and sisters.

Every Scottish Fold cat in the world can trace its heritage back to the first one, which was found in Scotland in the 1960s, says Cheryl Hogan, a Scottish Fold breeder and the committee chair for the breed at The International Cat Association (TICA).

It’s not uncommon to see cats in food stores in big cities as a form of free pest control.