l. Standard metabolic rate of western plumed pigeons (Lophophups femginea) averages 088 ml 0, (g hr)-’ during summer. This rate and the rate of evaporative water loss by these birds at 25°C are well below levels anticipated for birds of comparable size (81 g). 2. Summer and late fall birds did not have significantly different minimal thermal conductances, the means for both approximating l-8 kc...