Hi Peter,
That may well be a correct analysis. Any system can make a mess if it is not checked properly. There were no doubt transcription errors in the Atlas too, that was all based on species numbers. In this code Grey Fantail is GRFA and Grey Falcon is GYFA. I suppose whoever built the list assumed that Grey Fantail would be recorded abundantly and so chose to give that species the obvious code. Whereas Grey Falcon will always be rare, so they chose the less obvious code for it, because it requires someone to think about it only rarely …… if ever………
Philip
