--- title: "Sociable Weaver (Philetairus socius) | AnimalTracks.wiki" description: "The Kalahari architect that builds one shared straw mega-nest big enough for hundreds of birds, with some still standing more than a century later." image: "https://animaltracks.wiki/images/animals/sociable-weaver-1.webp" published: "2026-09-07" updated: "2026-09-28" --- # Sociable Weaver (*Philetairus socius*) > **Status**: Checked against 9 sources, listed under Sources below. > **Tagline**: The Kalahari architect that builds one shared straw mega-nest big enough for hundreds of birds, with some still standing more than a century later. > **Soundtrack Vibe**: Neo-Classical & Baroque Chamber // Terry Riley, "In C" > **Soundtrack Links**: [Spotify](https://open.spotify.com/track/4IIt36M11AQ5bHdzFQLEny) > **Vibe Match**: A whole colony shares one nest, and the weavers continually add material to keep it intact. In C is built the same way: every player works through the same short phrases at their own pace, and the parts pile up into one shared structure. ## Biological Superpowers & Stats - **Taxonomy**: *Philetairus socius* - **Danger Level**: Low - **Conservation Status**: Least Concern ([IUCN Red List](https://doi.org/10.2305/iucn.uk.2024-2.rlts.t22718731a263786878.en)) - **Superpower**: Collective architecture: colonies build the world's largest bird nest, an insulated haystack that can weigh several tons and shelter hundreds of birds - **Habitat**: Semi-arid Acacia savannas of the Kalahari region, southern Africa - **Diet**: Termites and other insects (about 80% of the diet), plus grass seeds - **Tags**: architect-builder, bird, social-colony, savanna, arid ## Natural History & Behavior ## A Sparrow-Sized Bird, a Six-Meter Nest At 14 centimeters tall and just 24 to 32 grams, the sociable weaver lives in the semi-arid acacia savannas of southern Africa's Kalahari. Colonies of these little brown birds build the biggest nest structure made by any bird on Earth: one shared, haystack-like mass with a roof of twigs and chambers of dry grass that can stretch more than 6 meters wide and close to 3 meters tall, packed with over 100 separate chambers and home to as many as 400 birds. The whole thing can weigh several tons, heavy enough to bring down the tree holding it up. Some of these mega-nests have stayed occupied, and constantly added to, for more than a hundred years. ## Built-In Air Conditioning The nest isn't built for size alone. Researchers White, Bartholomew and Howell found that easing the impact of low outside temperatures on the birds is one clear job it does. In a follow-up study during a Kalahari summer, they measured air outside a nest swinging from 16°C to 33.5°C, while the temperature inside an occupied chamber moved by only seven or eight degrees, staying inside the birds' comfort zone the whole time. > **Headcount is the thermostat.** The main way a colony keeps its chambers in that comfortable band is by changing how many birds sleep in each one at night. The engineering has limits. Straw spikes guard the tunnel entrances, but even the largest nests don't stop a Cape cobra in the warm season, and one snake may eat the eggs and chicks in every chamber of a large nest. ## A Cooperative With Hundreds of Roommates A single nest can shelter a colony of five to more than 300 birds. Males who help build it tend to be more closely related to the colony members around them than males who don't build at all, and chicks raised with extra helpers survive better than chicks raised by their parents alone. Helpers cut both ways for the breeders: females breeding with more helpers survive better themselves, but males with more helpers actually survive worse. About four-fifths of a weaver's diet is insects, especially harvester termites, with grass seeds making up the rest, and most never take a drink, getting all the moisture they need from their food. Weavers are relatively long-lived: the oldest one on record made it to 16. ## Landlords of the Kalahari Other animals move in too. The pygmy falcon, which also preys on the weavers, roosts and nests nowhere else. Kalahari tree skinks are more abundant in trees with a weaver nest than without one, take refuge in the nest when threatened, and even eavesdrop on the weavers' own alarm calls to know when trouble is near. ## Frequently Asked Questions ### How long do sociable weaver nests last? The materials need constant care, so the weavers keep adding more to hold the nest together, and some nests have stayed in continuous use for more than a hundred years. *(Source: [San Diego Zoo Wildlife Alliance]())* ### How do sociable weavers keep their nest chambers warm on cold nights? By choosing how crowded to get. Researchers counted up to five adults sharing a single chamber on winter nights, while in summer no more than two roosted together even though almost every chamber was occupied. *(Source: [Bartholomew, White & Howell 1976]())* ### Do sociable weavers migrate? No. Sociable weavers do not migrate, and a chick may never leave the nest it hatched in: a fledgling might just move into an empty chamber nearby. *(Source: [San Diego Zoo Wildlife Alliance]())* ### Why do pygmy falcons nest inside weaver colonies? Because the falcon depends on them. It relies completely on the weavers' nest for its own home, often nesting side by side with the weavers, even though it is also one of their predators. *(Source: [San Diego Zoo Wildlife Alliance]())* ## Sources 1. [Sociable Weaver. San Diego Zoo Wildlife Alliance.]() 2. [Philetairus socius. The IUCN Red List of Threatened Species 2024: e.T22718731A263786878.]() 3. [White, Bartholomew & Howell (1975). The Thermal Significance of the Nest of the Sociable Weaver Philetairus socius: Winter Observations. Ibis.]() 4. [Bartholomew, White & Howell (1976). The Thermal Significance of the Nest of the Sociable Weaver Philetairus socius: Summer Observations. Ibis.]() 5. [van Dijk et al. (2014). Cooperative investment in public goods is kin directed in communal nests of social birds. Ecology Letters.]() 6. [Paquet et al. (2013). Maternal Effects in Relation to Helper Presence in the Cooperatively Breeding Sociable Weaver. PLoS ONE.]() 7. [Paquet et al. (2015). Antagonistic effect of helpers on breeding male and female survival in a cooperatively breeding bird. Journal of Animal Ecology.]() 8. [Rymer, Thomson & Whiting (2014). At home with the birds: Kalahari tree skinks associate with sociable weaver nests despite African pygmy falcon presence. Austral Ecology.]() 9. [Lowney, Flower & Thomson (2020). Kalahari skinks eavesdrop on sociable weavers to manage predation by pygmy falcons and expand their realized niche. Behavioral Ecology.]() *Published September 7, 2026. 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