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Extreme Endurance Migration: What Is the Limit to Non-Stop Flight?

Figure 4

The relationship between flight metabolic power at cruising speed and body mass for a sample of well-studied birds (data compiled in [15]).

The bar-tailed godwit is shown as a red symbol estimated from information in [6],[20]. The relationship between power (y-axis) and body mass (x-axis) is y = 53.65x0.74, R2 = 0.94.

Figure 4