Tail length

Amongst the most frequent question I am asked about my birds is "What is the length of their tails?"  I think one of my bird's tails is about 16" though I cannot say for sure as my carelessness caused the tails to break at the root when they were growing.  On average, the primary tails range from 13" to 15".  Below are tails that were recently shed by one of my birds as part of its annual molt.It will be seen that the spine of the feather is very thin.  This results in a soft feather that enables the bird to wave very nicely during its display.