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Schnegg, A; Gebhardt, S; Keller, P; Visser, GH; Steiger, A (2007). Feeding behaviour an daily energy expenditure of domesticated budgerigars (Melopsittacus undulatus): Influence of type of housing and vertical position of the feeder. Applied animal behaviour science, 108(3-4), pp. 302-312. Amsterdam: Elsevier 10.1016/j.applanim.2007.01.008
