One of Australia’s most unusual species of waterfowl, the Musk Duck (Biziura lobata) is a highly aquatic, stiff-tailed duck native to southern Australia. Males have a large lobe of skin dangling under their bill which they inflate during courtship displays. The name Musk Duck comes from musky odour produced from a gland on the rump.
I came across a displaying male at Dunn’s Swamp in Wollemi National Park, NSW and was able to record the strange plonk-whistle display call. Listen with headphones as the ‘plonk’ sound is at a low frequency and may not be discernible on some speakers.