Small seeds and insects, such as beetles and caterpillars, make up the majority of the Grauer's scrub warbler's diet, which it searches for near the ground (2). They are monogamous and territorial birds, with each pair defending an area of 0.1 to 0.5 hectares during the breeding season (4). The breeding season is thought to occur in February and March in Democratic Republic of Congo (2); outside of this period, Grauer's scrub-warblers have been observed moving around their swamp habitat in groups of 10 to 12 birds (4).