Arctic Skuas repeatedly chasing passerines

On 24th and 25th July 1971, a weekend of rough, wet weather, I noted eleven and 38 Arctic Skuas Stercorarius parasiticus respectively at Aberlady Bay, East Lothian. They were continually chasing Kittiwakes Rissa tridactyla, terns Sterna spp and waders, and one which had the audacity to pursue a Gannet Sula bassana was successful after a three-minute ch

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