Taiwan Bush-Robin Tarsiger formosanus

Small, furtive, ground-dwelling songbird with thin white eyebrow. Adult males are slaty above and dusky ochre below, with a bright white eyebrow. Female is duller and browner overall, with a thinner eyebrow; note buffy-orange vent, which separates her from female and immature Collared Bush-Robins, which have white vents. Breeds in montane forests with dense understory and descends somewhat into similar habitats during the winter. Song is a short burst of pleasant warbled notes, and calls include a rising and mellow “wheet.” Formerly treated as a subspecies of White-browed Bush-Robin.