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Résumé :
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Summary. 1 Annual variations in the breeding season of the Rook near Oxford could be correlated with mean air temperatures in the period prior to egg-laying. 2 The most frequent clutch-size was four to five, and in five out of six years, broods starting as five raised on the average more young than broods starting as four, even though not one brood of five was completely successful. In the other year, broods starting as four and five raised on the average the same number of young per brood.
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