Whoa–bunnies can get fertile just by being around each other!!
OK, that sounded weird. But you know how dogs and cats and horses and all those other critters have their “season” where they can mate and get pregnant? Those “seasons” come on a kind of schedule, like every three months or every six months or whatever. With humans it’s every 28 days, right? (Were you paying attention in Health class?)
But with bunnies, all they have to do is hang out with the opposite sex for a day or two, and they become fertile–boom, just like that.
Explains where the phrase “breed like rabbits” comes from, huh?