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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).