I'm listening to a new(?) recording of The Cocks Are Crowing by John Doyle, noticed that he sings the line "If the Killey Boyne, it were my ink horn." I always thought that the killey boyne must have been a name for some kind of bird, so decided to google it, and came across this conversation. I took the meaning of the line to be something like -- if even he had all these birds singing together in chorus, (as well as the green fields and the pen of tempered steel), none of it could express his love's beauty or whatever. I have to go check the rest of the google list to see if anything came up about birds, but so far haven't seen anything.