Large and chunky with stout dark bill. Nondescript plumage: entirely olive-green with slightly brighter yellowish throat and upper breast. Sexes alike. Compare with female Red-throated Ant-Tanager, which is somewhat more slender and longer-tailed, has a more contrasting pale throat, and paler legs. Found in lowlands and foothills, where small flocks move through lower and middle levels of humid forests. Often in mixed feeding flocks with other species. Occurs from eastern Honduras to extreme northwestern Colombia. Listen for its loud, fast, long-winded song of whistles and chips, along with grating squeaky scold calls.