(quote from link) Wildlife film director Stephen Lyle is joined by cameraman Barrie Britton to recall their close encounter with two birds that revealed the sculpting of ornate structures and singing of songs beyond the vocal range of human beings in the courtship performance of the male vogelkop bowerbird. Making sense of the biology is Dr Joah Madden of Exeter University, who has spent the last ten years studying this sexual display.
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