(One of those bizarre potatoes can be seen here too.)
Similar specimens of other rodents, such as squirrels, have been found. This Squirrel King story had a happier ending than most:
This, and other recent king finds, suggest that the theory that Rat Kings were merely a hoax thought up by bored Rat Catchers (yes, that was a professional title), is probably incorrect.
Folklore has it that when rats were joined in such a manner they acted as one creature, sometimes with a single 'king' rat sitting on top and directing the others. Linguists however, tend to point out that they were called 'kings' due to their extraordinary weight compared to a single rat.