English: When weaver birds attack a field to feast (mainly in very large groups) a farmer may lose his season's harvest. This is because they do act as a group and this is attributed to how they live. Weaverbirds usually take over a tree and set up very many nests particular to that flying group. The places they live in are usually very noisy nests especially in the evenings when they retire for the night. The picture shows a group of weaver bird nests in Luwero, Uganda.