THE pouch of the marabou stork (Leptoptilos crumeniferus (Lesson), was described by Peters1 and its nature investigated by Chapin2. Chapin concluded that the pouch was inflated by means of air from the left nostril being driven into a pair of thin-walled sacs in the neck.
Peters, W. C. H., Monatsber. Akad. Wiss. Berlin, 168 (1866).
Chapin, J. P., Bull. Amer. Mus. Nat. Hist., 65, 468 (1932).
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Mucus Accumulation and Necrosis of the Ventral Air Pouch in a Marabou Stork (Leptoptilos crumeniferus) With Productive Rhinitis
Journal of Avian Medicine and Surgery (2013)
Journal of Zoology (2009)
Bulletin of Carnegie Museum of Natural History (2006)