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Fig. 5. Glomerular filtration rate (GFR) is responsive to water loading in
broad-tailed hummingbirds. (A) During midday, prior to food/water removal, GFR
increased linearly with increased water intake rate
(y=0.78x+1.36, r2=0.52, N=9).
(B) When we returned the food/water, following the
1.5 h deprivation
period, there was no relationship between water intake rate and GFR.