### Identification Commonly known as the African Social Spider, *Stegodyphus dumicola* is a member of the "velvet spider" family (Eresidae). To the naked eye, they appear as stout, fuzzy, charcoal-to-mottled-grey arachnids. Females reach about 10–15mm, possessing a distinctive, blocky cephalothorax and a bulbous abdomen covered in dense, short hairs that provide a velvety sheen. Unlike the spindly legs of orb-weavers, their legs are thick and powerful. While their cryptic coloration blends perfectly with dry wood, the best field mark is their communal nest: a messy, dense "apartment complex" of silk and debris, often the size of a football, nestled in thorny branches.
### Habitat & Range These spiders are icons of the arid and semi-arid landscapes of Southern Africa, particularly Namibia, Botswana, and South Africa. They favor thorn-scrub thickets and savannahs, specifically anchoring their silk fortresses to *Acacia* or *Dichrostachys* trees. Look for them in areas where the sun is intense but the vegetation provides sturdy structural support for their heavy, multi-generational nests.
### Behaviour Unlike 99% of spiders, *S. dumicola* is fiercely social. A single nest can house hundreds of individuals working in total harmony. They exhibit "cooperative brood care," where females (even non-reproductive ones) tend to the young. When a vibration hits the web, they don’t hunt alone; dozens of spiders swarm out in a coordinated "wolf-pack" attack to subdue prey.
### Diet Their diet consists of any insect unlucky enough to hit their sticky capture webs—primarily grasshoppers, moths, and beetles. By hunting together, they can take down prey ten times their individual size, dragging the carcass back into the interior of the nest to share the meal.
### Fascinating Fact These spiders practice the ultimate form of altruism: suicidal maternal care. When the spiderlings hatch, the adult females (both mothers and virgin "aunts") liquefy their own internal organs into a nutritious soup, which they regurgitate to feed the young. Once their reserves are gone, the spiderlings finish the job by consuming the females themselves—a process known as matriphagy.