unidentified bird call

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Gidday All,

I'm wondering if anyone can help me with this bird call please? It's from 
Magnetic Island, north Queensland and only calls pre-dawn, except once this 
afternoon after the sun had set. I recorded this this morning, and the mp3 is 
cobbled together from several recordings I made. It has been calling every 
morning for about six weeks now. It is ventriloquistic and shy. I know all the 
main calls of my usual backyard mixed flock of small birds, but this one has me 
stumped. It often calls in association with a Little shrike-thrush.

The call of interest is the two-note whistle repeated throughout.

Any help appreciated

Eric

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