I would have to say either #3 or #5. The extra branches and foliage add a certain amount of context but #1 and #2 have too much and I think it's creating a distraction. By shot #3 you've got enough foliage to make it clear you intended it to be there without it being quite so distracting. I might crop some off the top and bottom, however. In shot #4 the foliage is a distracting element. By shot #5 it's gone entirely, which I'm fine with. I think it's the cleanest shot overall. The branch "grounds" the bird and there's nothing at the edges pulling my eye out of the shot, or away from the subject.