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By V. Bels

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Two typical postures of duck feeding on food in water. (a) The animal controls the body position to be able to feed on food particles at shallow depths. (b) Upending feeding posture. The animal rotates the body to be able to position the head near the food source at greater depths. This posture results from an MAP performed by sequential action of the limbs and the body musculature. partially maintained at the surface and serves to bring the head into the water at the more efficient position for catching the food (Fig.

Meinertzhagen, R. (1954) Grit. Bulletin of the British Ornithological Club 74, 97–102. Michel, G. (1971) Zur Histologie und Histochemie der Schleimhaut des Drüsen- und Muskelmagens von Huhn und Ente. Maryland Veterinary Medicine 23, 907–911. I. and Ono, K. (1962) Glucagon deficiency induced by extirpation of alpha islets of the fowl pancreas. Endocrinology 71, 464–473. , Taniguchi, K. and Ishikawa, T. (1985) Immunocytochemical localisation of the pancreatic islet cells in the Japanese quail, Coturnix coturnix japonica.

Crassus cranioventralis. ) The proventriculus The proventriculus is a spindle-shaped organ that produces the gastric acids and enzymes and has very little function in storage. A remarkable deviation from this general model is found in the ostrich, in which the proventriculus is enlarged and displaces the ventriculus to the right side of the body (Pernkopf and Lehner, 1937). The large size of the proventriculus indicates that it is used for storage, especially since storage of food cannot take place in the rather small crop of the ostrich.

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