They're a symbol of fertility. What you should be asking is what Jesus has to do with Easter, the answer to that is nothing. (shock and awe! now watch the Christians get all defensive) Easter goes back to Ancient Babylonia and it was a celebration of Ishtar (pronounced Easter), her symbols were/are rabbits (fertility) and eggs (fertility again but also a symbol of rebirth). We can thank Constantine for all the lies and confusion. It's interesting what you can learn by studying history.