Abstract
A Christmas Bird Census A happy custom, now widely spread through Canada and the United States, is the combination of a holiday outing on or about Christmas Day with a methodical census of the birds in the district. The results, which give numerical statements of the bird population at many different pla-ces, ought to be as useful in interpreting the winter relations between residents and migrants, and the effects of different kinds of winters upon the distribution of birds, as summer censuses in Great Britain are in fixing the density of breeding populations. An indication of the extent of the Christmas Bird Census movement is given by the records of the observations made in Canada in 1931, published in the Canadian Field Naturalist of February 1932. Sixteen field clubs, ranging from Vancouver Island to Montreal and Toronto, have contributed their observations, generally made by small parties of observers- Ottawa had twenty-one observers in ten parties in the field, the Brodie Club of Toronto thirty observers in eight parties working from 7.30 a.m. until 3 p.m.
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Calendar of Nature Topics. Nature 132, 977–978 (1933). https://doi.org/10.1038/132977b0
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DOI: https://doi.org/10.1038/132977b0