As the male quietly approaches the female, he opens his mouth a full 180 degrees to make his distinctive "bonk" sound in her ear, knocking the female off of her branch. They repeat this sequence, and after the courtship is over, the female departs to build the nest and raise the chicks alone.
A male bird approaches a female, opening his mouth wide to make a loud "bonk" noise in her ear, causing her to fall from her branch. They repeat this behavior during courtship, after which the female leaves to build a nest and care for her offspring.