Abstract

Water and sodium influx rates were measured in free-living lions and spotted hyaenas by means of isotope turnover. Mean water influx rates were 53.7 ± 12.5 and 64.4 ± 30.0 ml kg−1 day−1 for lions and spotted hyaenas, respectively; mean sodium influx rates were 2.16 ± 0.84 and 3.47 ± 1.66 mmol kg−1 day−1, respectively. Sodium influx rates were used to derive mean rates of food consumption; 5.97 ± 1.53 kg fresh food per day for lions and 3.79 ± 1.24 kg day−1 for spotted hyaenas. Drinking did not contribute significantly to water influxes in winter, but with the advent of hotter weather in spring, drinking became an important avenue of water influx in two lions.

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