The Easter Bunny is associated with Easter largely due to its origins in pagan and Christian traditions symbolizing fertility, rebirth, and spring. The association began with German immigrants in the 18th century bringing the legend of an egg-laying hare called "Osterhase" or "Oschter Haws" to America. This hare would lay brightly colored eggs as gifts for well-behaved children, with children creating nests or baskets for the hare to leave the eggs in. The rabbit symbolizes fertility and renewal because of its prolific breeding, connecting it to spring themes and the concept of rebirth, which ties into the Christian celebration of Jesus' resurrection during Easter. The tradition gradually evolved to include chocolates and toys alongside the eggs.
The rabbit's connection to Easter also comes from the merging of pagan customs surrounding the goddess Eostre, who was associated with spring and fertility, whose sacred animal was the hare. Eggs similarly symbolize new life and fertility and were historically part of early Christian and pagan springtime celebrations, reinforcing these themes in Easter customs.
In summary, the Easter Bunny as a symbol emerged from ancient fertility and springtime symbolism, was adapted in European Christian traditions, and was popularized in America by German immigrants, combining these ideas to become a key part of modern Easter celebrations.