Hardhead or White-eyed Duck is the name of the only australian diving duck, the dark brown-reddish headed one in the sketches. And that is also the only one at the Brisbane Botanic Gardens. There is something wrong with one wing, he can't completely spread it so he can't fly. I wonder how he got to that place... maybe he was found injured, then rescued and released in that safe place. The other ducks in the sketches are the Pacific Blak Ducks.