Small bird with thin bill (longer than on most other gerygones), found only in dense mangroves along the northwestern Australian coast. Grayish brown above, off-white below, with pale eye. Juvenile has brownish eye. Similar Mangrove Gerygone has red eye, smaller bill, and white patches in tail; Large-billed Gerygone has dark eye and heavier bill. Unlikely to be seen outside mangrove habitat.