They look like pigs but they breed like rabbits.

I started with 2, gave them a fairly big area and in what seemed like the blink of an eye I had 20. I culled them (left 2 (big mistake)), went and processed the meat and dog my cat if there wasn't already another 20 in the pen. Another culling this time only leaving 1 for nostalgia. After processing the meat as I live and breath there's another 20. I think I saw a new star in the sky that night or maybe it was pregnant.

Now I don't have any rabbitpigs.

Seriously though they do breed very quickly.