The bird speak is something I invented for the sake of the comic.
I'm trying to make it uniform in what in bird is relayed but to put it short using the keys "~","^" and "*". Along with reversing the first and last letter of a word.
"Carmen" - "Narmec" - "^**~ Narmec"
Actually, the only thing that wasn't stolen at the Louvre's Apollo Gallery is the Regent Diamond, figure no one would take it because something to do with a curse.
I've also found that the two thieves were leaving for Algeria, thanks of a trace of DNA evidence recovered from a helmet and their past in burglary cases according to the police.