[YellowBolt]

Or rather, a rat king:


Wikipedia has more about this:

Rat kings are cryptozoological phenomena said to arise when a number of rats become intertwined at their tails, which become stuck together with blood, dirt, and excrement. The animals consequently grow together while joined at the tails, which are often broken. The phenomenon is particularly associated with Germany, where the majority of instances have been reported.

Most researchers presume the creatures are legendary and that all supposed physical evidence is hoaxed, such as mummified groups of dead rats with their tails tied together. Reports of living specimens remain unsubstantiated. One theoretical cause for the phenomenon is cramped living space; young rats might live too closely together, becoming inextricably entangled. However, the normal behavior of rats, which generally seek their own comfort, speaks against this theory. No scientific study has been performed to prove a natural cause of the phenomenon.

Talk about gross. I would not want to meet one of these things anyday ever.