Weaverbirds use knots known to fisherman and sailors to make a variety of complex nests with mazed entranceways designed to thwart predators. In the picture above they look like coconuts. The birds have a colonial "society" consisting of hundreds or even thousands of birds. Weavers are quite vocal, making [url=../sounds/kenya/2-9(weaverbirds).mp3]sweet, trilling, sparrowlike sounds[/url].