Black Headed Gulls fedding on Seaweed flies that are being flushed out of the seaweed on the strand line at high tide, at Boulmer, Northumberland, UK.

northumberland coast boulmer tide tidal high tide pebble rock sotne beach fly insect flee movement migrate migration escape sea weed seaweed fly coelopa frigida numeros food food source mass migration escape feed feeding food gull bird flight black headed gull larus ridibundus village cottage house housing location