Tree sap as an important seasonal food resource for woodpeckers: the case of the Eurasian three-toed woodpecker (Picoides tridactylus) in southern Finland - Pakkala, Timo; Piiroinen, Jarmo; Lakka, Johanna; Tiainen, Juha; Piha, Markus; Kouki, Jari (Finnish Zoological and Botanical Publishing Board, 2018)
Keywords: phloem sap; sapu use; three-toed woodpecker; Picoides tridactylus; coniferous trees; phloem; sap; woodpeckers; boreal forests; coniferous forests