Learning to swallow?

In my wanderings today, I came across a row of up to seven juvenile fledgling swallows, who were perched on a wooden rail.  The adults were weaving around in the air above them catching insects.  Every now and then one of the adults would zoom down to the rail, and feed their offspring while flying past.  The adult never stopped to land.  Occasionally one of the more developed fledglings would take off and meet the adult to receive its meal on the wing.  But the rest of the fledglings just sat and bickered over whose turn it was to be fed next :-)

The actual moment of feeding took place incredibly quickly, if you were to blink you would have missed it. Getting the shot required a fair bit of patience, the fledglings were fairly spread out on the rail, such that no more than 3 were in shot at any moment, so I had to guess where the adult would go next.  I managed to guess right only about 1/4 of the time :-)  

 In theory I could have tracked the adult and panned in with it as it approached the rail, but there were several adults and it was never clear which one would choose to zoom in and feed the offspring next.

I like this shot the most, of those that I took.  Although the adult is a bit dark, and the angle means that the tail is not displayed as well as it might have been, the outrage of the youngster who has missed out captures the feeling of the whole thing nicely.