Weaver species list / RELATED SPECIES: Bocage’s Weaver / Cape Weaver / Chestnut Weaver / Fox’s Weaver / Heuglin’s Masked Weaver / Speke’s Weaver
IUCN: Least concern / Discovery: 044
Categories: acacias, baobab, pest, Nest use
Discovery
The above is based on Weaver Wednesday 2, a weekly series about the discovery of each weaver species.
This species text first appeared as Weaver Wednesday [161] – Discovery [44]: Chestnut Weaver on 2015-07-15
1. Basic biology
Identification. The Chestnut Weaver is named after its colour. The adult male (photo above) in breeding plumage is a distinctive chestnut with a black head. There are 2 other chestnut coloured birds in Africa. The Cinnamon Weaver (see photo here) is similar but has yellow wing edges (rather than pale) and yellow vent (rather than brown as in the Chestnut Weaver). The Chestnut Sparrow Passer eminibey has chestnut wing edges and is smaller than the Chestnut Weaver. Female and non-breeding male Chestnut Weavers are much browner than other weavers, with buff or chestnut breast-band and flanks, and in southern Africa the grey bill is distinctive. Juveniles are similar but with streaked breasts (see photo here). Distribution. Two subspecies of the Chestnut Weaver are currently recognised (see map above, based on Birds of Africa): There are vagrant records from southern Namibia and South Africa – see here) for a map and links to pdfs describing these records. Habitat. Chestnut Weavers inhabit dry thornveld. Food. The Chestnut Weaver feeds on grass seeds and also on insects. In East Africa it feeds mainly on wild grass seeds but switches to cereal crops (especially sorghum) in Feb-Apr, and thus being a pest. Non-breeding birds flock and roost with other granivores and may form large mixed roosts. Breeding. This species is monogamous and polygynous and highly colonial, with 500 or more nests covering trees in a small area. For example, following exceptional rains in Namibia, over 100 trees had 40-100 nests in each. Colonies are established at different sites every year, although sometimes the same sites are used again in Namibia. Breeding is fairly well-synchronized within a colony. Males are present during the nest-building phase, displaying with beating wings from their nests. Males leave the colony during the breeding cycle, often while the females are incubating. The males form nomadic flocks and start moult, leaving colonies occupied only by females and young birds.
The nest is built by the male of grass stems (photo above, from phown 2476). The nest is retort-shaped with a short spout (sometimes absent). Nests are usually suspended from the tip of branches, sometimes 3-4 nests hang in a string below one another or are clustered together. Nests look untidy, having protruding grass stems. The nest ceiling and floor are lined with grass heads. Females do all the incubation and feeding of young, since the males leave the colony early. Red-headed Finches and other species often nest in old nests, and Red-headed Finches also take over active nests. |
The above is based on Weaver Wednesday, a weekly series about weaver species.
This species text first appeared as Weaver Wednesday [26]: Chestnut Weaver on 2012-12-12
2. Breeding facts
Pair bond monogamous and polygynous Breeding season Nest site Nest building Colony size Clutch size Egg colour Egg size Incubation Chicks and nestling period |
Breeding information based on Handbook of the Birds of the World, Vol. 15.
3. Photos of Weaver Nests
Vm 29288 |
Vm 29239 |
Vm 29211 |
Vm 29192 |
Vm 26743 |
Vm 26239 |
Thumb-nails of some recent PHOWN records