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| | THE TRACHEA OF THE HOODED MERGANSER (Site not responding. Last check: 2007-11-07) |
 | | Male Smew (Mergellus albellus).--The trachea of the male Smew is about nine inches long (Yarrell, 1843: 281; MacGillivray, 1852: 235) or from 3« to 5 inches longer than that of the male Hooded Merganser. |
 | | The tympanum of the male Smew possesses, according to Latham (1798: 124), one round fenestra covered by a drum-like membrane and, on the op- posite side, a smooth, oval, hollow bone which is united with the membrane. |
 | | Female Smew.--No information was obtainable regarding the length of the female Smew's trachea, but a life-size drawing of a portion of the trachea (Yar- rell, 1843: 281) shows it to be uniform in width, with a diameter of 1'- of an inch, the same as for the female Hooded Merganser. |
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