When it comes to nests, common sense suggests that large birds build large nests, and small birds build small nests. But in fact, some species of smaller birds build large nests. None, though, builds anything like the communal structures of Sociable Weavers in southern Africa’s arid plains. These House Sparrow-sized birds often live in accommodations with room for up to 500 birds. Each family has its own access hole and tunnel into a chamber within the larger complex. Some structures have persisted for more than 100 years, with constant occupation by succeeding generations. 

More info and transcript at BirdNote.org. 

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