Northern Brown-throated Weaver Ploceus castanops

Identification. The Northern Brown-throated Weaver breeding male has a dark chestnut face and throat which looks black from a distance. It is distinguished from the Golden-backed Weaver and Yellow-backed Weaver when in the same papyrus swamps, by the golden yellow crown and underparts.The female has a streaked back and tawny-buff breast and is distinguished by black lores and a pale eye, a buff (not yellow) supercilium, lack of yellow on the underparts, and a more slender bill. The female Orange Weaver has a pale bill and whitish underparts.

The range of the Northern Brown-throated Weaver does not overlap with the similar Southern Brown-throated Weaver.

Distribution. The Northern Brown-throated Weaver is locally common in Uganda and surrounding countries in the Lake Victoria basin (see map above, based on Birds of Africa). No subspecies are recognised.

Habitat. The Northern Brown-throated Weaver inhabits waterside vegetation along lakes and rivers, especially in papyrus and ambatch. It visits forest and woodland habitats in the non-breeding season.

Food. The Northern Brown-throated Weaver feeds on seeds, including millet, and also on insects. It forages in small flocks, often with other weavers, on the ground, in vegetation and on floating aquatic plants. The foot structure shows adaptations typical of papyrus specialists.

Breeding. The Northern Brown-throated Weaver is apparently monogamous. It is colonial, with 5-6 nests in one site, but also nests solitarily. The nest is placed in tall elephant grass, low shrubs, in reeds, papyrus, bulrushes or ambatch. It sometimes breeds in mixed species colonies.

The nest is rounded, tightly woven, and with the entrance below covered by a small projecting porch. The nest is built by the male from strips of grass and creepers, and lined with fine grass and some feathers.

The clutch is 2-3 eggs, and egg colour is pinkish or pale blue, plain or spotted with red-brown. The chicks are fed by both male and female.

Known nest predators include egg-eating snakes. Old nests may be used by Swamp Flycatchers Muscicapa aquatica.

Breeding season
all months, with peak egg-laying Mar-May and Sept, in Uganda; in Feb-May and Jul in DRCongo

Nest site
placed in tall elephant grass or low shrub, or in swamps, in reeds, papyrus, bulrushes (Typha) or ambatch

Nest building
built by male

Colony size
Colonial, with 5-6 nests in one tree

Clutch size
2-3 eggs

Egg colour
either pinkish or pale blue, immaculate or spotted with red-brown

Egg size
average size 22.5 x 14.5 mm (Uganda)

Incubation
no information

Chicks and nestling period
chicks fed by both male and female