[PDF] Schaaf, A., Ruggera, R., Vivanco, C., Tallei, E., Benavidez, A., Albanesi, S., Rivera, L., Politi, N. 2020. Tree use, niche breadth and overlap for excavation by woodpeckers in subtropical piedmont forests of northwestern Argentina. Acta Ornithologica 55 (1): 111-119