The small, unassuming wren may be nothing much to look at, but wait till it starts singing. Its loud, complex songs, and its tendency to sing them throughout winter, has earned it the title of “King of Birds.” But on December 26, the king is dead. Wren Day is a traditional hunting of the wren, followed by celebrations that include disguise, door-to-door visiting and parading, and song. It’s certainly one of our most strange and mysterious Christmas customs, a mixture of Celtic mythology, old ...