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Fig. 6. (A) Phylogenetic tree used to reconstruct the phylogenetically independent
contrasts of body mass and flight cost. (B) The effects of flight mode
(hovering nectivore, slow flight in both nectivore and non-nectivores, and
fast forward flight in non-nectivores) on the costs of flights relative to the
expectation from body mass with the effects of lack of phylogenetic
independence removed. Flight mode had a large significant effect, with the
costs of slow flight in non-nectivores and hovering in nectarivores exceeidng
the costs of slow flight in nectarivores and fast flight in
non-nectarivores.