Known feather

A few days ago I posted a feather of which I didn't know its owner.
S&A commented on my blog that it belonged to a woodpecker.(bonte specht)
Yesterday they visited to celebrated both our birthdays.
As a present they gave me a beautiful book, with all information about bird tracking.
In the book was the proof... of the Owner of the feather!
By more research the feather is one of his hands.

Thanx to A&S!