The Yellow-rumped Thornbill is the largest and probably the best-known thornbill, with a striking yellow rump. It is mainly grey-olive to grey-brown above to cream below, with a white-spotted black crown and a dark eye stripe. The tail is black, with white tips. The sexes are similar. Young birds have softer, fluffier plumage on the body, but are otherwise similar. Often seen in small flocks feeding on the ground, often with other thornbills and ground-feeding birds.