Unlike Luka, I do not live on the second floor, but I do live on the first floor. From the kitchen windows I look down in my garden. And in that garden one day, years ago, I left behind this bucket. Just forgot it there after something I did and never took it in again. Gradually it filled up with water and it turned green-ish. Like a miniature pond.
Which must be exactly what some birds think too. The big ones around have decided it's perfect for a drink every now and then. So, when I'm lucky (especially now the hibiscus hanging over it has no leaves yet) I get to see some of them visiting this bar. Pigeons mostly, but a few days back also one of the great looking great spotted woodpeckers living in the "park" next door ...
Hope you took a pic of woody as well. Nice reflection.
If I had, I would have shown it instead of this guy looking into the bucket