Large, long-tailed, long-billed, dull-olive tetraka. Madagascar endemic that is found in rainforest, dry deciduous forest, and locally in spiny forest. Prefers the mid-story, and often joins mixed flocks with tetrakas and other birds. Song is a fairly musical phrase of up-and-down whistles. Call is a rough “trek-trak”. Separated from tetrakas by its larger size and its longer bill and tail. Doesn’t have the pale eye-ring of Spectacled Tetraka or the gray head of Gray-crowned Tetraka. Much more olive-colored than brush-warblers.