During courtship display a male hummingbird can climb up to 40 metres before dive bombing passed the female at maximum possibel speeds. At the lowest point of the dive he rapidly spreads and then closes his tail feathers. The spread makes the tail feathers flutter and produce a distinctive sound that is specific to each species. The size, shape, mass and rigidity of the hummingbird's feathers, determine the tone of each species' particular sound.
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