Bird Trachea

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“a, an inch of trachea, contracted to the utmost, the rings looking like alternating half-rings; b, the same, stretched to two inches, the rings evidently complete, with intervening membrane.” Elliot Coues, 1884


Bird Anatomy


Elliot Coues Key to North American Birds (Boston, MA: Estes and Lauriat, 1884)


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