Biology

Size

Male:

  • wing: 231–251mm
  • tail: 99–117mm
  • bill: 42.7–47.3mm
  • weight: 820–1050g

Female:

  • wing: 204–240mm
  • tail: 90–112mm
  • bill: 41.0–45.3mm
  • weight: 680–870g

Breeding

There are no obvious social courtship rituals.

Nests are made in sheltered locations such as:

  • caves
  • hollow logs
  • holes in bank up to 30m from river edge

Eggs are laid late August to October (or December if the first brood fails). Broods of 3–7 (usually 6) white eggs are laid and incubated by the female for 33–35 days.

About half (54%) of nesting attempts lead to successful hatching of ducklings. Flooding or mammalian predation can lead to nest failure.

60% of ducklings survive to fledging.

Both parents care for the young throughout a 70–82 day fledging period.

Life expectancy

Mean lifespan: 6–7 years.

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