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The Metabolic Cost of Swimming in Ducks

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Figure

Fig. 4. Drag on a 32 ft (9-6 m) ship hull plotted against actual speed and percentage hull speed.Figure adapted from Marchaj (1964).
Fig. 5. Mean cost of transport of four ducks at different swimming speeds.
Fig. 7. Stroke rate of duck's feet at various swimming speeds. A linear least squaresregression line for the data has the equation: Strokes/sec = 2-44 + (i -i4X io~*xswimmingspeed, m/sec).

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