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- W1995718763 abstract "1. X-ray measurements of hummingbirds indicated that initially food passed only to the crop. 2. Food intake experiments with nine tropical species of hummingbirds (2·7–10·1 g) indicated that crop volume is a linear function of body weight. 3. Nectar concentrations of flowers visited by hummingbirds in the lowlands were equivalent to 0·61–1·23 M sucrose, while nectar from highland flowers was equivalent to 0·29–0·68 M sucrose. 4. At a given ambient temperature, small hummingbirds have less storage capacity in their crops relative to their metabolic rates per g than larger hummingbirds. 5. A major factor for the energetics of hummingbirds is the lower nectar concentration from flowers in the highlands where the hummingbirds are exposed to lower ambient temperatures." @default.
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- W1995718763 title "Crop volume, nectar concentration and hummingbird energetics" @default.
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- W1995718763 doi "https://doi.org/10.1016/0300-9629(72)90117-x" @default.
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