Strange birdcall

["Russ Lamb" <>]

Anthea,
           I have been hearing a similair sounding call, also in the 
pre-dawn, and during day as well.The call I hear is of only two to three 
seconds duration,a single note which  does descend, though not by a great 
amount (as the call is of such short duration).
            So I checked my BOCA tapes, and there it is, the non-trilling 
call of the Fan-tailed Cuckoo. After hearing the tape and going back outside 
to once again try and find the bird, TWO Fan-tailed Cuckoos left the same 
tree together. They hadn't once done their downward trill, and I wondered 
whether this short,single note was serving some other purpose. ?contact 
?courtship.
Russ Lamb, Maleny, SEQ