The food of mallard Anas platyrhynchos platyrhynchos collected from coastal and estuarine areas
Olney, P.J.S. (1964). The food of mallard Anas platyrhynchos platyrhynchos collected from coastal and estuarine areas. Proc. Zool. Soc. Lond. 142: 397-418
In: Proceedings of the Zoological Society of London. Academic Press: London. ISSN 0370-2774, more
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