Growing tail feathers

I consider it extremely lucky that I was able to observe this change in the Oriental Pied Hornbill so easily, simply because it's frequently sighted in this taman, its home.
     When I first saw it with its oh so short black tail feathers, I thought it was another Hornbill!  A Google search revealed that it was actually growing its black tail feathers.
     An extract of  http://www.besgroup.org/2011/04/01/oriental-pied-hornbills-moulting-rectrices/ of a similar sighting, provides useful explanation:

“… the central long black tail feathers that were part of (the) rectrices, on the top part of (the) tail, were missing …. The rectrices must be in moult with the two distinct black tail feathers discarded. Only the white feathers that were normally hidden under the two central black feathers were present. … exposed, … the white rectrices that were usually hidden were not completely white. The upper part of these feathers was in black. A close-up image of (the) tail revealed two new pin feathers had begun to grow out from her tail, replacing the discarded black feathers on top of the remaining rectrices. The tube-like sheaths with new emerging vanes were clearly visible."

     A couple of weeks later, its tail feathers seemed to have grown fast and well.

     And a recent sighting shows that it can flaunt once again the natural length of its beautiful glossy tail feathers.