Channel-billed Cuckoo (Scythrops novaehollandiae)
I was lucky enough to at last get a photo of a Channel-billed Cuckoo. This was taken while on Stradbroke Island the other day. The juvenile bird was calling to its host parents, in this case Torresian Crow.
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The Channel-billed Cuckoo is the largest of all parasitic birds, well over half a metre long, with the wingspan approaching a metre. When in flight from below it looks like a flying cross.