Ruff (Philomachus pugnax) 22 mei 2018 https://www.np-lauwersmeer.nl/wp-content/uploads/2018/05/XC233524-Kemphaan-Philomachus-pugnax.mp3 “Ruff (Philomachus pugnax)” van xeno-canto door Jarek Matusiak. Genre: Scolopacidae.
