IN July, 1944, I had an opportunity of studying the territorial behaviour of Ringed Plover (Charadrius h. hiaticula), at Malahide, Co. Dublin, where large numbers nest in and around the tern colony. The conditions for observation were exceptionally favourable. At one place a narrow basin of salt-marsh about 400 yards long by about 100 yards wide is separated from Malahide inlet by a tapering spit

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