Abstract
1. 1. A direct weighing method of determining avian evaporative water loss under conditions of controlled temperature and humidity was developed. 2. 2. Ambient water vapor pressure and evaporative water loss are inversely related in Excalfactoria chinensis at 32,25 and 15°C. 3. 3. Evaporative water loss at a given temperature in E. chinesis is proportional to the water lossa vapor pressure gradient between the environment and evaporative surfaces. 4. 4. Maximum rates of gular flutter in a variety of species are roughly inversely related to the size of the gular area. 5. 5. Panting and gular fluttering may occur at rates determined by the resonant characteristics of thoratic cavity and gular region, respectively, or at apparent nonresonant frequencies.
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