Hi - I have a new and arresting sound in thick trees near my Tuggeranong back door. It sounds like well separated blows on a cheap slide whistle. It runs in an obvious cycle over about 20 or 25 seconds: the whistle bursts at
the beginning of the cycle are initially lower, last about one second, and rise a touch at the end of each burst. Then, as the cycle proceeds, the tone of each burst rises, and they come closer together. The final few whistles are high and urgent. It is loud.
Any help obviously would be appreciated. - Ross
Any suggestions?