Usually Yoll bathes at night, when its impossible to film her normally, but I caught her in the morning.
Owls bathe in several steps. First, they thoroughly rinse themselves, then walk around to let water drip down, then they come back and repeat. And again 34 times.
Why does Yoll clicks his beak while bathing, I do not know. Apparently, it scares all sorts of swamp monsters just in case.
The water is not dirty, it is green because of the algae that lives on the walls of the basin.