When I was little, I was feeshin' at Starmount- catching fook all.
One of the bastards flew down and grabbed a fish off the surface.
My brother was not amused, and when it came back he fired off a pebble with his maggapult.
TWAT!, right under it's wing- it left.
Now then, arm yourselves with maggapults (not an offensive weapon) and seasides usually have pebbles about.
Put a few in to get a spread and fire away