The Choir

I could find no useful information on this, but came away with the idea that huge bird flocks (excluding pigeons) are still commonly seen and many people (including me) are pleased by the sight (as long as I’m not directly beneath them for long).  I couldn’t track the orifinal source of the first three pictures, though I tried.  (The one I’ve included is one of them.)
photo source: Imgur from Imgur