Gatherings of Grey Herons Ardea cinerea at traditional standing-grounds during the breeding season have been noted by several authors (Beetham 1910, Huxley 1924, Lowe 1954, Milstein et al. 1970), and the behaviour of the birds at these standing-grounds has been investigated (Birkhead 1973). Gatherings of herons outside the breeding season seem to have attracted less attention (see pages 162-163 in

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