So the quelea form little neighborhoods surrounded by familiar birds, individuals they know will stick to their own nest and not try to steal from them. A newly arrived, unfamiliar male poses a bigger threat than a familiar neighbor going about his own nest building. It’s called the “dear enemy effect.” The birds get to know their neighbors very quickly. One quelea signals its identity to another by flashing its face, making it easy for the neighbor to quickly learn who it is. “Once that’s settled,” says Dale, “everyone can stop harassing each another and get down to the business of nest
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