Even in the busiest cities, humans are not the only residents. Sydney Harbour has been fairly successfully cleaned up over the last
decade and a number of animals are returning to the Harbour waters. This Australian darter (a male) has the sharp pointed bill of
a fish spearer, unlike cormarants, which have a hooked bill. Darters do not have oil in their feathers as ducks do, and they are
far less bouyant. Consequently, when swimming at the surface, only their head and neck is exposed, which has lead to this bird
being referred to as the "Snake Bird". It also means that the feathers become waterlogged, so the bird can't fly easily on exiting
the water.