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To be honest I don't know anything about these birds. My friend and I just deduced from their behaviour that they were mating. A fluttery tumple down a cliff face. The male flies off and returns, and the female clambers back up. Lol. All the while another male watched from a tree, and two other males came by and left. The first male eventually got tired and was out-jazzed by the other male who swooped in and began showing off. Shortly thereafter, they all left.
Very nice!