The Kilombero weaver’s small and patchy distribution is dictated by a number of biological factors, including a close physical association with reeds, as during flooding this is the only emergent vegetation on which it can feed. It cannot successfully inhabit areas near trees, due to these wooded areas being the home to a competitor, the golden weaver Ploceus subaureus (3). As well as the flowering and fruiting heads of reeds, the Kilombero weaver has also been observed feeding on human refuse, such as cooking waste, and can often be found around artificial habitats; perched on wooden huts, pecking at smoked fish or scavenging waste from behind shops (3). It is thought to breed during the wet season, probably between January and April, which may be due to the availability of high quality food from reed heads at this time of the year (3). Kilombero weavers nest in colonies of up to 30 pairs, on reed stems frequently overhanging water, and lay clutches of one to two eggs (4). In the dry season they have been seen in flocks, foraging on the ground (3).