Attributes / relations provided by
♦ 1Prunus mahaleb and Birds: The High-Efficiency Seed Dispersal System of a Temperate Fruiting Tree, Carlos M. Herrera and Pedro Jordano, Ecological Monographs Vol. 51, No. 2 (Jun., 1981), pp. 203-218
♦ 2Birds and berries: a study of an ecological interaction. Calton, Great
Britain, Snow B.K., Snow D.W., 1988, T & AD Poyser. 268 p.
♦ 3Birds and guelder rose Viburnum opulus: selective consumption and dispersal via regurgitation of small-sized fruits and seeds, Ángel Hernández, Plant Ecol (2009) 203:111122