This is a close-up image of the wax seal found on Moriarty’s clues to Sherlock in The Reichenbach Fall.
Can you tell what it is?
…It’s a Magpie, with a bit of stolen treasure in its beak.
And the song that Moriarty plays while he is breaking in to the Tower of London, the Bank of England, and Pentonville Prison?
…The Thieving Magpie Overture, by Gioachino Rossini.
Magpies also have a rather well-known tendency to steal shiny objects, and are rather aggressive towards other birds.
Sounds rather fitting, no?