Our metabolic data at 25 8C compare favorably to
published values of metabolic rates within the thermoneutral
zone for American Kestrels. Kestrels in this study were
tested while postabsorptive during the active phase of the
daily cycle. Although this may limit our comparisons with
published thermoneutral metabolic rates, we believe that
measuring metabolism under artificial rainfall conditions
during the active phase is more ecologically realistic than at