There was thunderstorm rain on Tuesday September 14th and Wednesday September 15th. Sun: Thursday 16, Friday 17 Saturday 18. Low clouds Sunday 19. More generally, the summer was stormy and rainy which meant that undergrowth were very wet, the ponds, little ponds and puddles filled up.
This morning, there was a strong fog but he got up before noon, which would certainly have allowed a start in migration.
I see that Julge returned to Saint Hilaire le Petit: it's more quiet than Pontfaverger. But I can't answer the question: what does s/he find to eat?
I got to watch a bit on FB today. Indeed, there are many exchanges and a rather unhealthy kind of excitement...