Hen harrier sighting

This is the first time that I see a hen harrier here in Sardinia. I was taking some photos during a chilly morning, where the grass was frozen when I saw a bird of prey on a group of stones. I soon realized that it wasn't a buzzard, because I've never seen a raptor like that. So I tried to take some pictures, using the Sony 100-400GM and the 1,4x teleconverter because it was pretty far. The picture is only for documentation.