1. 1. We compared the use of the barometric method and pneumotachography for measurement of ventilation in the little penguin Eudyptula minor. 2. 2. Simultaneous use of both techniques showed the barometric method to give a reliable estimate of tidal volume. 3. 3. Comparison of birds with and without masks for pneumotachography showed wearing masks to produce a significant increase in ventilation, principally through a raised respiratory frequency. © 1988.
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