The term “mischief” is used to describe a bunch of rats. The terms “colony,” “plague,” “pack,” and “swarm” are also acceptable. A rat king is an extraordinary occurrence in which a huge number of rats become entwined by their tails as a result of harsh conditions and excessive amounts of blood, filth, and faeces.
In Europe, the rat king was viewed as a bad omen from the Middle Ages and into the 18th century, when the brown rat gradually supplanted him. Despite their evident physical disadvantages, rat monarchs may survive for extended periods of time, according to physical evidence. This is seen in certain mummified specimens whose tail fractures have developed calluses.