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Figure 5.4 Changes in food intake and body mass in a captive White-crowned Sparrow Zonotrichia leucophrys during the spring migration period. After King (1961).

12 16 20 24 28 32 36 40 44 48 Day of experiment

12 16 20 24 28 32 36 40 44 48 Day of experiment

Figure 5.4 Changes in food intake and body mass in a captive White-crowned Sparrow Zonotrichia leucophrys during the spring migration period. After King (1961).

understand why any birds migrate by day, apart from overland soaring species (Chapter 4).

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