my today´s observation. The bird stayed long time on one tree probably having a rest. I have heard the voice and thank to it I was able to locate the bird in the treetop. The distance was too long for 300 mm glass.
Immature bird. https://en.wikipedia.org/wiki/Red_crossbill
Medník hill near Sázava river, Central Bohemia, August 2017
Nedospělý jedinec Křivky obecné pozorován dnes na posázavské turistické stezce pod vrchem Medníkem.