As an example of sexual dimorphism, the male Mockery Birds have a large hump on their beak, while the females have only a small, bony shield. The bird was named after its call, that sounds like laughter (much like the kookaburra's).
To demonstrate sexual variation, male Mockery Birds display a noticeable protrusion on their beak, whereas females have a smaller, more rigid protection. The species was named after its distinctive vocalization, which bears resemblance to laughter.