The latest position of BTO cuckoo 115597 is here, in the south of France, not far from the Alps and the border with Italy and Switzerland. There hasn't been an update for over a week, so I expect another soon. 115597 is no longer the most southerly cuckoo, there is one in Bosnia and another on the border between France and Spain. I wonder if they will loiter in this area for some time whilst building up the energy to cross the Mediterranean. and onwards into Africa? We shall soon see, I don't doubt.