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During the breeding seasons males being building nest.

The nests are partially built when the males display to passing females by flapping their wings and calling while hanging to their nests. The female inspect and choose the nest before signalling approval to the male.Once a male and a female are paired, the male goes on to complete the nest including the entrance tunnel, males are solely incharge of building the nests, though their female partners may join in giving the finishing touches. Studies have shown that nest location is more important than nest structure the female decision making.
Pic: First is edited second is without edit.