22.10 Kaia suddenly reacts to a threat nearby. Some kind of owl voice was heard just before. It could be that a bigger bird flew by..
EDIT: It is a call of a male Ural Owl ( Strix uralensis) https://xeno-canto.org/641933 ( later comes also a different voice that I don't regognize)
22.11 Kaia settled back on the eggs.
22.12 The owl hooting now come from the other side ( it must have flown past a minute earlier) These are similar sounds to what Karl heard some night ago. Kaia is very alert.
22.16 Kaia stands again, ready to defend the eggs. She stands almost frozen. At a close inspection you see a dark shadow move in the upper right corner of the screen ( a bigger bird on the tree) and a few moments later this shadow mover to the left- the bird flies past again.
The arrows on the image show the starting position of the strange bird and the direction of the movement. The fast moving shadow of this bird is partly captured in the circle.
The bird moved to another nearby tree behind the nest. The sound it makes is the same as Karl heard a few nights ago.
22.22 Kaia sits on the eggs again although the raptor is still nearby, but she has to continue incubation.