A rat.

A Rat is a type of rodent, and one of the most successfull mammals on earth. They now live everywhere on land except for Northern Russia, Northern Canada, Northern Alaska, Iceland, Greenland, a couple of tiny islands, Antarctica and Alberta.

Unlike many species that have struggled with the intervention of humans, rats have been able to thrive in it, and spread diseases that have killed millions of people over the years.

The most famous disease that is known to have been spread by rats is the Black Death.

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