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the advice that we have received from the british trust for ornithology was that less damage would be caused to the birds by closing in late autumn or early november than in march
y cyngor a gawsom oddi wrth ymddiriedolaeth adareg prydain oedd yr achosid llai o niwed i'r adar o gau ddiwedd yr hydref neu'n gynnar ym mis tachwedd nag ym mis mawrth