Pakkala, Timo, Jari Kouki, Markus Piha, and Juha Tiainen. “Phloem Sap in Fire-Damaged Scots Pine Provides Instant Foraging Opportunities for Three-Toed Woodpeckers Picoides Tridactylus”. Ornis Svecica 27, no. 2–4 (October 1, 2017): 144–149. Accessed September 28, 2022. https://journals.lub.lu.se/os/article/view/19568.