Bunny ears are an untradeable cosmetic holiday item worn on the head. A pair of bunny ears can be obtained by completing one of the Easter holiday events that occur once per year. This also rewards the player with all other holiday items associated with Easter.
Before the 2014 Easter event, reindeer hats and bunny ears spawned in two out of 100 random locations in every world between 14 and 21 July 2013. When picked up by a player, it would immediately spawn in another location.