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Fig. 2. Relationship between flight cost and (A) body mass
(y=4.86–0.21x, r2=0.11), (B) wing amplitude
y=5.45–0.029x, r2=0.13) and (C) wingspan
(y=0.25x–2.66, r2=0.09), which
were the only parameters that had a significant influence on flight cost.
