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188  SECTION I  III  The Birds
































                    Figure 18-9  •  A mallard duck still unconscious from an earlier general anesthesia. Note the broad, gently arched bill and the small oval-
                    shaped nostril just above the radiographers thumb.






































                    Figure 18-10  •  Combined family of Canadian geese graze the   Figure 18-11  •  Close-up view of a Canadian goose, its beak wide
                    fresh summer grass just beyond the shoreline of the South   open while its oral cavity is transilluminated. Note the teethlike
                    Saskatchewan river.                                  serrations along the edge of the mandible.




















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           ch018-A02527.indd   188                                                                                    2/11/2008   11:01:03 AM
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