This is a long-tailed, medium-sized "warbler" with a distinctive bold white supercilium.

The bird's plumage is unstreaked, with olive-brown uppersides (including the crown and wings) and creamy white undersides.

[citation needed] The New Caledonia grassbird typically inhabits scrubby areas in the lowlands and hills of New Caledonia, particularly maquis minier with ferns, but also secondary forest and grasslands, and has even been seen in dense rainforest.

The New Caledonian grassbird favours dense cover and is retiring in its habits and is a difficult bird to observe or study.

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