Communal nests can accommodate even 400 birds!
Sociable Weavers are best known for their giant communal nests, the largest built by any bird, which can house 400 birds and last 100 years!
Another interesting example of nest building is performed by sociable weaver birds of southern Africa, which nest in a single huge, cooperatively built structure with separate entrances. With the ingenuity of accomplished architects, the sociable weaver constructs the largest and most spectacular of all communal bird nests which some times can accommodate even 400 birds.
A communal nest can fill up an entire tree canopy and may last for 100 years. The enormous nest is divided into rooms for nesting, feeding and sleeping. Rooms in the center of the large nest retain heat, so the birds roost in them at night, when it is cold outside. During the day, they cool off in the outer rooms.
The most interesting thing is, his family doesn't have to live in the dark, though they do not have electricity. Weaver bird is smart enough to get it done by fireflies. He catches fireflies, brings them in and sticks them to the walls of the nest, where they spend rest of their lives as light bulbs!