Today arrived at 09h and he sings. It seems someone is nearby (not simply greetings).
Kergu calmed quickly down, moved some moss, pooped (very good) and settled down in his comfy nest.
Kergu spent the night in his nest (resting while staying).
In the early morning he wake up, than preening, some nest-work, walking in the nest, observing the surrounding and back resting while sitting and so on.
He flies away at 07.26