I would reply that (having researched mimicry extensively in regard to the
Regent Honeyeater's behaviour), Carol's comment is significant. "I find it
interesting that both this bird and the bird Ricki heard were mimicking a sound
they were actually hearing at the time. I can't remember whether this was also
the case when it mimicked the Brown Thornbill, but it's quite possible."
Typically (except for the Regent Honeyeater) birds don't do that. The behaviour
described here is similar to that described for the Chorister Robin in Africa.
See refs in my Regent Honeyeater articles. Actually it is hard to know if that
is really happening from one or two observations. It could have learned the
call earlier and just happen to use it at that time. I know very little about
the Rockwarbler (having only ever encountered them on one day, several years
ago). However when this discussion started, it seemed to me to be a likely
mimic candidate. Of course it is an entirely different question as to whether
the mimicry was in any way directed towards the model species - which is what
is special about the Regent Honeyeater.
This may be related to the strange habit of Thornbills of mimicking
butcherbirds and similar when being handled for banding.
Philip
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