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Lochmias nematura nematura
This specimen was taking Bamboo leafs and picking up leaves and leading to a hole in a rut, to build a nest.
I found these specimens on an edge of a river, near a Bamboo Grove, in a region of transition between the Cerrado and Atlantic Forest.
In last photo, the hole.
Looks pretty close to the Wood Wren, but can't find one with spots extending to the belly.