if you read some of the old grimoires, especially medieval manuscripts ( check out esotericarchives) like the Claviculas Solomonis Rex (Key of Solomon the King) , there are several workings that supposedly allow one to "undersatnd the language of birds". It is said that bird-speak is the tongue of Angels, and yes the great mysteries are revealed in such. then again, if you speak the angel's tongue, you'd already be there right?
Sine experientia nihil sufficienter sciri potest -Roger Bacon
*γνῶθι σεαυτόν*