Вьетнамская серпоклювка Napothera danjoui

Smudgy, dark brown babbler with a short tail and a long bill shaped like a scimitar (a curved sword). Generally similar in appearance to other long-billed wren-babblers but no range overlap. Forages on the ground in lowland and mountainous broadleaved forests, often in densely vegetated areas where it can be exceedingly difficult to see; listen for its song, a series of short haunting whistles.