A gregarious species, the slender-billed babbler forages in noisy groups, searching leaf litter for insects, worms and caterpillars (4) (5) (6). Although a sociable, restless bird, it rarely shows itself and is reportedly hard to spot as it moves through the dense grass, except for during the breeding season when it is more conspicuous, largely due to its loud singing (5).
The breeding season of the slender-billed babbler falls between May to June in north-east India and between March and May in Nepal (5). Its nest is a deep, cup-shaped structure made from grass and leaves, placed in a bush surrounded by grass (6). It lays three to five pale blue eggs (6).