Usually seen in pairs, the reclusive straight-billed reedhaunter spends most of the day concealed amongst dense, low vegetation. It will, however, move to a more exposed perch during territorial displays, when it produces a series of high-pitched notes ending in a trill, tsi-tsi-tsi-tsi-tsi-tititititititi (3) (5). Little is known about the reproductive behaviour of the straight-billed reedhaunter, but it is known to lay an average of three eggs in a dome-shaped nest situated within vegetation (3).