Recently, farmers in Estonia found a creepy "rat king" in a chicken coop, in which the tails of a group of rats were intertwined, which was an "extremely rare" event. According to legend, when the tails of rats are entangled together, they evolve into "rat kings".
In Estonia there are such superstitious rumors that the rat king is an imminent sign of the plague. According to Andrei Miljutin of the Natural History Museum of the University of Tartu, the so-called "rat king" is just an extremely rare natural phenomenon, with only 60 cases in nearly 500 years of recorded history, and this time it is one of the only live sightings in modern times.
However, he added, it is possible that most rat kings were never discovered, or disposed of without being reported, or never acted on their reports. The most recent record of Rat King's discovery was in 2005, but no video data was left.
The tails of 13 rats can be found tightly intertwined in the video, two of which are dead.