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Variation in wingbeat frequency as a function of morphological parameters for 14 species: (a) body mass, (b) residual wing loading (where positive values indicate species with higher wing loading than expected for a given mass) and (c) wingspan. Birds with similar flights style are marked with the same colour: red represents specialist soaring fliers, green represents obligate flapping fliers and the blue indicates birds that use mix of flapping and soaring.
