A Sociable Weaver Apartment House
On a dry plain in southern Africa, you may spot a huge shape high in a tree. It looks like a haystack that someone has stuck in the branches. It is really a nest, and it is built by small birds called sociable weavers.
Most birds build a nest for one pair. Sociable weavers build one for a whole crowd. Many pairs share a single big nest made from grass and sticks. A nest can grow so large and heavy that it sometimes pulls down a branch.
Inside, the nest is like an apartment building. Each pair has its own chamber with a hole that opens on the underside. The birds line the chambers with soft grass and feathers. The entrances face down, so a snake finds it harder to climb in.
The thick roof of grass does more than hide the rooms. The grass keeps out the sun in the hot day and holds in warmth on the cold night. The birds can stay comfortable in a place where the weather swings widely from day to night.
The weavers keep adding grass and sticks all year. Over many years, a nest can last for a very long time. Other creatures, such as small owls, sometimes make a home in its edges. The weavers' nest may be a home for a lot of neighbors.