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Text File  |  1992-09-02  |  266b  |  8 lines
  1. In birds, a thin-walled extension of the
  2. lungs. There are nine of these and they
  3. extend into the abdomen and bones,
  4. effectively increasing lung capacity. In
  5. mammals, it is another name for the alveoli
  6. in the lungs, and in some insects, for
  7. widenings of the trachea.
  8.