1. Abe, T. (1979) Foraging behaviour ofStreptopelia orientalis and the control methods of its injury.Shokubutsu-Boeki 33: 508–512 (in Japanese).
2. Alcock, J. (1979)Animal behavior. An evolutionary approach (2nd edition), Sinauer, Sunderland, Mass..
3. Benjamini, L. (1980) Feeding behavior of the chukar (Alectoris chukar) in sugar beet plantations.Phytoparasitica 8: 3–18.
4. Crook, J. H. (1965) The adaptive significance of avian social organisations.Symp. Zool. Soc. Lond. 14: 181–218.
5. Kidokoro, T. (1984) Damage to rice plant by spot-billed duck,Anas poecilorhyncha, and effect of several bird-protection devices.Bull. Appl. Ornithol. (Tokyo),4: 31–36 (in Japanese).