The Grey-crowned Babbler is the largest of Australia's four babbler species. It is dark brown-grey above, with a distinctive grey crown stripe and a dark face mask that contrasts with a white eyebrow. The chin and throat are white, running into a pale grey lower breast. It has a long, curved bill, short rounded wings with cinnamon brown wing patches and a long tail tipped white. The eye is pale yellow in adults. There is a darker-coloured subspecies, rubeculus, in north-western Australia (often called the Red-breasted Babbler), that has a rufous lower breast and darker crown stripe. The Grey-crowned Babbler is a noisy and gregarious bird, usually found in small groups of four to twelve, and is often seen on the ground or in low trees.