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" ... Each bird was placed into a respirometry chamber -- a device that estimates the rate of metabolism for whatever creature is placed inside. Its function is based upon the idea that whatever goes into an organism -- food, air or water -- will come back out again sooner or later in the form of carbon dioxide and water. Measuring the CO2 and H2O gases as they build up inside the chamber provides an estimate of metabolism (or, as in this study, evaporative water loss). ... "