Wood Pigeon Preening

Captured at a substantial distance (75-100 meters?), with continuous shooting. Note that the tail feather in the bill has been pulled from the far side of the feather it belongs to. The strand above the bill is also in play, but I'm not sure what's going on with it.*  The overall posture is typical.   Not much else to report--a cloudy day. 
* An ornithologist friend explained it in an email:
"A major function of preening is "rezipping" adjacent barbs on a feather.  The barbs hook together like zippers or velcro to form a continuous vane.  As a bird flies around, bumps into things, etc., some of the barbs get disconnected (unzipped), resulting in a less continuous vane, and thus a feather less effective for flight or insulation.  In this case several strands of the outermost tail feather got separated, and the bird is rejoining them."  

I've marked the map for the rough location of the bird.