system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If Australia is so dangerous how did such a small number of rabbits breed so much so quickly?
gpt
That's what rabbits do, everywhere. It's kind of their thing. They breed like .... rabbits. The are generally considered a pest in most places wherever they exist, though not to the levels of ecological menace that they are in Australia.

Their success in Australia is attributed to lack of natural predators, evolving into a particularly hardy breed, and mild winters that allow them to essentially breed year-round.