Rabbits have been associated with springtime since ancient times. It is believed that the Anglo-Saxon Goddess of Spring, Eostre had a hare as her companion. The hare symbolises fertility and rebirth. Later Christians changed the symbol of the hare to the Easter bunny.
The tradition is that the Easter bunny leaves Easter eggs on Easter Sunday. Parents hide eggs in the garden and the children go on an egg hunt to find them.
The idea of an egg-laying rabbit was taken to America in the 1700's German immigrants. They told their children to make 'nests' with their caps and bonnets, and if they were good the Easter bunny would leave them coloured eggs.