Bonaparte's Gull in Cornwall 'foot-paddling' to disturb organisms

I was interested in the note by Philip A. Gregory and John Cantelo and in the accompanying editorial comments (Brit. Birds, 64: 76-77) on a Sabine's Gull Larus sabini persistently 'treading' to disturb organisms. On 30th March 1968 I observed somewhat similar behaviour by an adult Bonaparte's Gull L. philadelphia in St Ives harbour, Cor

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