I had assumed until recently, that this marking was of the breeder marking the tail of the bird before it went to sale- to identify who was who- since the bird is not close rung.
Going through some older threads I notice that some other blue series birds have similar dark blue markings on their tails- which leads me to this question.. is it dye or is it an actual marking- if it is an actual marking why do only some have it, and what does it mean?
Ben? Rod?
Cheers
