These birds are Hamerkops and native to Africa & Madagascar.

The lower bird was perched on the branch, when the other (larger) bird suddenly flew on top of her and started to flap its wings, putting on quite a performance …

I was taken aback by the sudden appearance of the larger bird and almost missed the opportunity to take their pictures for being slow on the draw.

But the birds may not be actually mating. Information gathered from the web said that Hamerkops only actually mate when a pair is building a nest, but they engage in a ceremony or courtship display called “false mating” where males may pretend to mate with females by hopping on their back with crests raised and wings fluttering, while emiting a chorus of cries …

Another trivia about Hamerkops gleaned from the web is that they are also called The Lightning Bird, as anyone who robbed a Hamerkop’s nest would allegedly die from a lightning strike ..!