Auckland Teal (Anas aucklandica)

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Image of a Auckland Teal in its natural habitat
Birds Teal

Introduction

The Auckland Teal, also known as the Auckland Island teal or tētē kākāriki, is a small flightless duck endemic to the subantarctic Auckland Islands of New Zealand. Its accepted scientific name is Anas aucklandica. The species is one of three brown-plumaged teals endemic to the New Zealand region and is closely associated with predator-free islands, sheltered shorelines and wetland habitats.

Physical Description

The Auckland Teal is a compact duck measuring about 45 centimetres in length. Males weigh approximately 550 grams and females about 420 grams. Both sexes have dark brown plumage, a conspicuous white eye-ring, dark brown eyes, and dark grey bills, legs and feet.

The species is sexually dimorphic. Adult males have a green iridescent sheen on the head, a dark chestnut breast, and barred light and dark brown flank feathers. A smudgy white patch is usually visible at the base of the tail. Females are more uniformly dark brown.

The wings are very short, with the primary feathers extending only about halfway along the back. This reduced wing structure is associated with the species’ flightlessness. Young birds are less distinctly marked than adults, but detailed age-related plumage differences are not well documented.

Range and Habitat

The Auckland Teal is endemic to the Auckland Islands, an isolated subantarctic archipelago approximately 500 kilometres south of Bluff, New Zealand. It occurs on several islands and islets in the group, including Enderby, Rose, Ewing, Dundas, Disappointment and Adams islands, but it has been extirpated from the main Auckland Island, where introduced cats and pigs remain a major limitation.

The species uses a wider range of habitats than its restricted distribution might suggest. It is commonly found along sheltered shorelines, especially where kelp and other seaweed accumulate. It also inhabits peaty streams, freshwater pools, wetlands, seepages, tussock grassland and areas of dense sedge or fern cover. On Disappointment Island, birds may live around seabird burrows and mollymawk nesting areas without regular access to the shoreline. Individuals have also been recorded in streams at relatively high elevations on Adams Island.

The Auckland Teal is non-migratory and has no recognised geographical variation. Its distribution is determined largely by the availability of suitable habitat and the absence of introduced mammalian predators.

Behaviour and Diet

Auckland Teals are generally crepuscular and secretive, although they may be active at night and can roost in full sunlight when they have a clear view of approaching danger. Despite being flightless, they can run quickly across rough ground when alarmed. Pairs maintain territories throughout the year, while unpaired birds may remain concealed between territories or gather in small groups where food is concentrated along sheltered shores.

The species is predominantly carnivorous. Its diet includes small marine invertebrates, crabs, molluscs, terrestrial arthropods and their larvae. It also takes seeds from rushes and grasses, and feeds by dabbling in shallow pools and peaty wetland ooze.

Auckland Teals are monogamous and strongly territorial. Breeding may begin in late October, with early broods commonly observed from December. Nests are usually concealed at the base of tussock or sedge clumps, in fern, or in other protected ground cover. The female normally incubates a clutch of three or four pale fawn eggs alone for about 30 to 35 days, while both adults care for the ducklings. Young birds may remain dependent for approximately 60 to 70 days.

Identification Tips

Look for a small, dark brown, flightless duck with a white eye-ring, dark grey bill and very short wings. Birds are often encountered on sheltered shorelines, beside kelp windrows, or near peaty pools and streams.

Adult males are identified by their greenish head sheen, dark chestnut breast, barred flanks and pale patch at the tail base. Females appear more uniformly dark brown. Their secretive behaviour and habit of running rather than flying are useful additional clues.

The flightless Campbell Island teal is smaller and darker, but the two species are separated most reliably by location. The flighted brown teal of mainland New Zealand is larger and has much longer wings that reach the base of the tail when folded.

Conservation Status

The Auckland Teal is listed as Near Threatened on the IUCN Red List and as Nationally Vulnerable under New Zealand’s national conservation assessment. The wild population is considered likely to exceed 1,000 individuals, although the species is commonly seen only in some island populations and is not numerous overall.

Historically, introduced mammals caused a severe contraction in the species’ range. Cats and pigs eliminated the teal from the main Auckland Island, while introduced rats and other mammals have posed serious risks to subantarctic island wildlife more broadly. The species is also vulnerable to the accidental introduction of predators, competitors or disease to currently pest-free islands. Southern skuas are natural predators and may take teal, particularly where birds are exposed.

Conservation has focused on protecting the remaining island populations, maintaining strict biosecurity, monitoring numbers and preserving predator-free habitat. The removal of rabbits from Enderby and Rose islands in the 1990s was followed by recovery of grasses and rushes and an increase in teal numbers on those islands. Re-establishing the species on the main Auckland Island remains a long-term possibility, but would depend on effective removal and continuing exclusion of introduced predators.

Frequently Asked Questions

Where does the Auckland Teal live?

The Auckland Teal lives only in the Auckland Islands, a subantarctic archipelago south of New Zealand. It occurs on several smaller islands and islets but not currently on the main Auckland Island.

Is the Auckland Teal flightless?

Yes. Its wings are extremely short and the species cannot fly. It compensates by running quickly and moving through coastal vegetation, tussock, wetlands and rough island terrain.

What does the Auckland Teal eat?

It mainly eats small marine and terrestrial invertebrates, including crabs, molluscs, arthropods and their larvae. Seeds from rushes and grasses are also taken, and the birds dabble in shallow freshwater pools and wetland ooze.

Is the Auckland Teal nocturnal?

The species is mainly crepuscular, meaning it is most active around dawn and dusk. It can also feed or move at night and is generally secretive, particularly where it is exposed to predators.

How does the Auckland Teal differ from the brown teal?

The Auckland Teal is smaller, flightless and has much shorter wings. The brown teal of mainland New Zealand is larger, flighted and has wings that reach the base of the tail when folded. Adult male Auckland Teals also have distinctive barred flanks and a greenish head sheen.

Why is the Auckland Teal threatened?

Its main historical threat has been predation by introduced mammals, especially cats and pigs on the main Auckland Island. Because the remaining populations are confined to isolated islands, accidental introductions of predators, competitors or disease could cause serious local declines.

References

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