Black-headed Gulls foot-paddling on grassland

Joh. J. Frieswijk's letter (Brit. Birds 70: 266), recording frequent observations of Black-headed Gulls Larus ridibundus foot-paddling on grassland in the Netherlands, contrasted with my note drawing attention to the lack of British observations (Brit. Birds 69: 180-181). I have now received confirmatory information of the behaviour in West Germany a

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