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Fig. 3. Renal fractional water reabsorption (FWR) is responsive to water loading in broad-tailed hummingbirds. (A) There was no relationship between water intake rate and glomerular filtration rate (GFR) during the evening (filled circles) or morning (open circles). (B) Hummingbirds decreased renal FWR to dispose of excess ingested water during the evening (y=–0.13x+0.89, r2=0.66, N=7).