Do giant fierce man eating rats exist?

yes, of course.

these exist in great quantities across North America and in parts of Western Europe.

there is also evidence that an invisible variety may exist.

good luck!

Rumours suggest that these first appeared in the late 1990s after an accident at a US biotech lab (company names and sources not given for legal reasons), and quickly spread across North America and into Europe. Recent reports suggest they may have now spread to Africa, the Middle East, China and Australia.