Birds sketching lines in the sky

If you click on this image to enlarge it, you find birds in flight, sketching lines in the sky. The birds fly over Mantri's in the mornings between 6.30 and 7.00 a m. But they don't seem to take the same flight corridor every morning.
The birds vary their flight-path. My frustration is that they show up on days when I don't carry my camera. Mr R N Singh (C-1004) an accomplished photographer with his high-powered Nikon, and I with my amateur Kodak, waited in vain for three days before I could get this photo.
Mr Singh has agreed to share with us some of his photos.