Identification of a Kakadu bird
It is great bowerbird (Chlamydera nuchalis). It is much bigger than the mentioned flycatcher. I have seen both species and there is no room for confusion. Most of the pictures online are birds perched on the ground next to their "buildings", but I found a picture that should convince you.

 

Notice: 

-Stout bill

-Patterned wing coverts 

-Marks on the undertail coverts