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♦ 1FLESHY FRUITS OF INDIGENOUS AND ADVENTIVE PLANTS IN THE DIET OF BIRDS IN FOREST REMNANTS, NELSON, NEW ZEALAND, PETER A. WILLIAMS and BRIAN J. KARL, New Zealand Journal of Ecology (1996) 20(2): 127-145
♦ 2VARIATIONS IN SPINDLE EUONYMUS EUROPAEUS CONSUMPTION BY FRUGIVOROUS BIRDS DURING THE FRUITING SEASON, Ángel HERNÁNDEZ, Ardeola 50(2), 2003, 171-180
♦ 3THE IMPORTANCE OF BIRDS AS BROWSERS, POLLINATORS AND SEED DISPERSERS IN NEW ZEALAND FORESTS, M.N. Clout and J. R. Hay, NEW ZEALAND JOURNAL OF ECOLOGY, VOL 12, (SUPPLEMENT) 1989, pp. 27-33
♦ 4Birds and berries: a study of an ecological interaction. Calton, Great
Britain, Snow B.K., Snow D.W., 1988, T & AD Poyser. 268 p.