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Flight Modes in Migrating European Bee-Eaters: Heart Rate May Indicate Low Metabolic Rate during Soaring and Gliding

Figure 7

The distribution of wing beat frequency of European bee-eaters during stopover (foraging flights) and cross-country flight (flap-glide flights).

Figure 7

doi: https://doi.org/10.1371/journal.pone.0013956.g007