Here, the gull is seen actually catching a couple of worms. It is quite an intriguing behaviour reminiscent of the facts behind the World Worm Charming Championships, which take place in the village of Willaston (Cheshire, U.K.) since 1980. Participants must encourage worms to the surface of the ground by vibration means only (no digging allowed!). The current record is impressive: 567 worms in 30 min from a 3 sqm plot. I was also wondering if the gull behaviour arose when they feed in puddles in the beach and when adopting it on grass, found by chance it actually encourages worms to surface. I can only say, Blackbirds, learn!
Common Gull checking for the effect of its dance