Researchers document how broadbills make loud wing song

Broadbills - birds found in some parts of Africa - produce a startlingly loud sound that they make with their wings to mark off territory. Males fly abruptly in a tight circle, landing where they began, and produce a klaxon-like sound - brreeeeet! - that they could also be using to attract females. Researchers have hypothesized that it is the outermost wing feathers that make the sound, but no studies have been conducted to verify this hypothesis.

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