Little bird bouncing with it's reflection

I was just doing some work when the noise of a bird distracted me. It spent nearly half and hour flying back and forth, jumping up and down at its own reflection! I've seen him at this windows several times in the past as well. I think it is a Sparrow but I'm not very good with bird identification. Anyone know? :)

Видео Little bird bouncing with it's reflection канала Tony H