The first thing an Easter Dragon does after it hatches is gather up all its eggshell pieces, and hide them somewhere on your Island. Does the Easter Dragon love fun and games, or does it just hate Caretakers seeing their eggs? Research into this topic is inconclusive so far.
Caretakers and mother dragons become annoyed with young Easter Dragons because Easter Dragons love to steal and hide eggs. If you take your eyes off them for a second. Easter Dragons will take eggs from the Nest and hide them in Mushmold.
Adult Easter Dragons (eventually) learn that hiding eggs is wrong, and out of respect for their fellow dragons, they'll resist the temptation to snatch eggs from the Nest. Sometimes, when the urge becomes too great, they'll steal an egg, only to return it a few hours later, looking guilty.
By the time an Easter Dragon reaches Epic form, other dragons grow to love its shenanigans. Once a year, Caretakers provide the Easter Dragon with its own special Easter Eggs to hide around the Island, and other Dragons try to find them.