Blue ducks are highly territorial and will vigorously defend their river territories (typically a 1–2km stretch of river) all the year round.
Territorial pairs have a regular daily routine:
Feeding occupies about a quarter of the bird’s active day. They sometimes also feed at night.
The birds feed mostly in shallow water at river edges by:
Their diet consists predominantly of invertebrates that include:
The ducks will also consume silt and periphyton (algal and microbial growth on submerged surfaces), and where present, will take berries from riverside plants.
Blue ducks do not migrate - they are highly sedentary.
Adult pairs establish a territory that they occupy throughout the year and throughout life.