Seagulls stomp the ground with their feet in a rhythmic pattern called "worm grunting" to attract earthworms to the surface where they can be caught. This technique causes vibrations that mimic heavy rain or mole tunneling, tricking worms into escaping underground. While seagulls may have learned this behavior by observing other species, the first bird to discover this effective food finding method likely spread it to others through social learning as young seagulls watch and imitate older ones.