And you're basing this on........what? Did you see feathers? Beaks? Nest debris?
Or is it because your beliefs dictate to you that they must be birds?

Seriously. What are you seeing that absolutely emphatically identifies these as birds?

You see, your guess (and that's all it is) doesn't over-ride someone else's guess. So I'd keep your 'moron' comments a little closer to your vest!!!