One day in the late 1200s, animals classified as black rats were seen in the Gobi desert, killing hundreds and moved from country to country with very poisonous fleas on their backs.
EEK! A rat, what should I do, what should I do?!
Finally, now I can get some sleep....
As the rat infection spreaded, the black rats later took interest in boarding trading vessels traveling to England, France, and the rest of northwestern Europe. The rats infected and killed many of the crews on the ships, and later, crewmen wished to dispose of them when they reached Europe.
Ok, everyone! We are now setting sail for England!
When the rats reached England, the death toll rose magnificently, yet so unfortunately. Millions of people died during the infection so gruesomely and so quickly, that by the end of the Bubonic Plague in the later 1300s, over 40 to 60 million people had died.