The influence of the sex-hormone testosterone on body temperature and metabolism of the male Japanese quail (Coturnix coturnix japonica).

Testosterone causes a significant body temperature decrease in male quails. Oxygen consumption/g b. wt remains the same, however.     

Metabolism-weight relationship in some small nonpasserine birds

Summary The metabolism — weight relationship 24 different nonpasserine birds follows the equation M=0.138 W^0.716. No pronounced differences could be found, relating to the metabolic rate per unit body weight, between these birds and representatives of the order Passeriformes.     

The influence of the sex-hormone testosterone on body temperature and metabolism of the male Japanese quail (Coturnix coturnix japonica)

Summary Testosterone causes a significant body temperature decrease in male quails. Oxygen consumption/g b.wt remains the same, however.     

Energy metabolism,respiration frequency and O2-consumption per breathing act in 11 different sunbird species during day and night

Summary The mean metabolic rates of 11 sunbird species are in the expected range based on data from other birds. Nevertheless the difference between day and night levels is greater (58–69%) than normal. Breathing frequencies among these birds correspond more closely to the (higher) levels found in empirical data for mammals. O₂-consumption per breathing act remains nearly constant during day and night indicating that the diurnal cycle of O₂-consumption is regulated mainly by modulation of breathing frequencies, which correlate directly with gaseous metabolism.     

Metabolism-weight relationship in 17 humming-bird species at different temperatures during day and night

Summary The mean metabolic rate during day and night of 17 different humming-bird species is considerably higher than the expected value for nonpasserine birds. The weight-metabolism regression exponent for the night-time is in the same range as that reported for other avian orders (and mammals); 0.73.