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Résumé :
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Summary. 1 Two expeditions were made to the forests of North-West Africa in January-February 1950 and April-June 1951. 2 The mountains and forests are described. The discontinuity of the forests and the dry area of Western Algeria, where the forests are thin, are of particular importance in the distribution of the woodland birds. 3 It is shown that there is a close correlation between the rainfall of the different patches of forest and the number of species of resident woodland birds occurring in them. 4 An account is given of the bird populations of the different types of forest, as found by the writer in winter and spring. 5 The breeding seasons of the three Titmice in different habitats are summarized. There are differences of up to a month between the breeding seasons in different localities, but the order in which the three species breed is the same. 6 An annotated list is given of all the species obsened. R. regulus is added to the North African list.
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