Fayt, P. “Available Insect Prey in Bark Patches Selected by the Three-Toed Woodpecker Picoides Tridactylus Prior to Reproduction”. Ornis Fennica 76, no. 3 (September 30, 1999): 135–140. Accessed November 13, 2024. https://ornisfennica.journal.fi/article/view/133508.