The animals were delivered to scientists at the University of Tartu.
This is the first find of a rat king in Estonia in the last 15 years, but only about 60 rat kings have been discovered in the world in 400 years.
Until now, it has been believed that the tails stick together when the rats are lying together in a nest. The tails are very flexible and nodules form during awakening.
Usually, animals found in this condition are already dead because they cannot move to find food for themselves, but these rats are found alive. After research, 13 rodents will be put to sleep, and they will become museum exhibits.