Abstract
1. Fasting metabolic rates and energy reserves were determined on Horned Larks ( Eremophila alpestris) captured during the brood-rearing season. 2. Metabolic rates were similar to allometric predictions, and lipid reserves were comparable to those of other brood rearing passerines. 3. Like most small passerines, Homed Larks had only enough lipid reserves to withstand a climatically typical period of overnight fasting. 4. Glycogen reserves were only adequate for a very short fast, which may necessitate protein catabolism for gluconeogenesis.
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