And literally mixomatosis was researched and “created” circa 1850 to get rid of said Australian rabbits. According to my failing memory, it goes like this: In 2 years 95% Australian rabbits died, and 5% were resisting. Obviously the population regrew. And the researcher tried to bring it back home in UK to get rid of the rabbits in his garden. He succeeded... to kill 95% rabbits of England. Which regrew from the resisting 5%. And same from France.

It’s the disease that makes rabbit have red eyes (very easy to spot from far away). But beware, I’m storytelling from memory, huge details must be wrong.