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G'day Dan,
The National Photographic Index of Australian
Wildlife publication - The Robins & Flycatchers of Australia by Walter E
Boles - in its species description of the Eastern Whipbird (Psophodes
olivaceus) commencing on page 403, has an article published by the observer
Edwin Ashley, who studied the bird in Southern Queensland in 1903 and was able
to confirm that it was a dual call by both male and female.
A second article also appears which
was written in 1908 by L. G. Chandler who conducted a study just
north of Melbourne in which he was able to confirm that the male
Eastern Whipbird is capable, under certain conditions, of giving both
calls.
Hope this helps
Cheers
Phil Joy.
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