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Black stilt / kakī

Status Nationally critical (next stop, extinction)

The black stilt (Himantopus novaezelandiae) or kakī (Māori) is the world’s rarest wading bird, with their numbers plummeting to just 23 adult birds in the 1980s. Along with predation from introduced mammalian predators, in particular ferrets, competition and hybridisation with the pied stilt has contributed to their population decline. Kakī have been intensively managed since 1981. In 2005, the population had increased to 55 birds in the wild through the Department of Conservation’s intensive management programme (see 4 minute video).

Kakī / black stilt on nest Photo by Dave Murray, courtesy of the Department of Conservation

Kakī / black stilt on nest

Braided river status

Once common throughout New Zealand, the black stilt / kakī is now restricted to the braided rivers and wetlands of the Mackenzie Basin, South Island (distribution map) (with two rares exception in the Ashley River estuary). You can see black stilts/ kakī at the Department of Conservation’s captive breeding centre near Twizel. Each pair of black stilt / kakī defends a territory, and nest alone, on stable banks near the water in braided riverbeds, side streams and swamps.

Recent observations

naturewatchHover your cursor over thumbnails below to see the latest observations (newest left). Click on thumbnails for more information including the location (opens in the NatureWatchNZ website).

Description 

Black stilt / kakī are a compact bird about 40cm long. They are very distinctive with completely black plumage and long red legs. Endemic (unique) to New Zealand, they are regarded by Māori as a taonga species (living treasure). Kakī first breed when aged two or three years, and are known to mate for life. If they cannot find a kakī mate, they may sometimes breed with the pied stilt, a close relative. Juveniles are black and white, their plumage darkening to black as they reach maturity. This can lead to them being mistaken for pied stilts.

Releasing juvenile Kakī at Lake Tekapo

Releasing juvenile Kakī at Lake Tekapo

Conservation efforts

A day in the life of an aviculturalist: Nick Tomalin was a volunteer with the Kakī Recovery Programme last summer while on sabbatical from The Royal Society for the Protection of Birds in the United Kingdom.

More information

Research papers

  • Galla, S (2015 BRaid workshop) Black stilt/kakī: a brief history of conservation genetic management and goals for genomic research
  • Hagen et al (2011) Conservation Genetic Management of A Critically Endangered New Zealand Endemic Bird: Minimizing Inbreeding In The Black Stilt (Himantopus novaezelandiae). The International Journal of Avian Science 153(3):556-561.
  • Keedwell et al (2002) Predator Control For Protecting Kaki (Himantopus novaezelandiae)—Lessons From 20 Years of Management. Biological Conservation 105(3):369-374.
  • Maloney & Murray (2001) Kaki (Black Stilt) Recovery Plan 2001–2011. Department of Conservation, Wellington.
  • Millar et al (1997). Captive Management and Molecular Sexing of Endangered Avian Species: An Application To The Black Stilt Himantopus novaezelandiae and Hybrids. Biological Conservation 82(1):81-86.
  • Sanders (1999) Effect of Changes In Water Level On Numbers of Black Stilts (Himantopus novaezelandiae) Using Deltas of Lake Benmore. New Zealand Journal of Zoology 26(2):155-163.
  • Sanders & Maloney (2002) Causes of Mortality At Nests of Ground-Nesting Birds In The Upper Waitaki Basin, South Island, New Zealand: A 5-Year Video Study. Biological Conservation 106(2):225-236.
  • Steeves et al (2008) Development of Polymorphic Microsatellite Markers For The New Zealand Black Stilt (Himantopus novaezelandiae) and Cross-Amplification In The Pied Stilt (Himantopus himantopus leucocephalus). Molecular Ecology Resources 8(5):1105-1107.
  • Pierce (1982) A Comparative Ecological Study of the Pied and Black Stilts in South Canterbury. Ph.D. thesis. University of Otago, Dunedin, New Zealand.
  • Pierce (1984) Plumage, Morphology and Hybridization of New Zealand Stilts Himantopus spp. Notornis 31(1): 106-130.
  • Pierce (1986) Differences in Susceptibility to Predation Between Pied and Black Stilts (Himantopus spp.). Auk 103(2): 273-280.
  • Pierce (1986) Foraging responses of stilts (Himantopus spp.: Aves) to changes in behaviour and abundance of their riverbed prey New Zealand Journal of Marine and Freshwater Research (open access PDF)Pierce (1996) Ecology and Management of The Black Stilt Himantopus novaezelandiae. Bird Conservation International 6(01):81-88.
  • Cameron et al (2005) Improving predator capture rates: analysis of river margin trap site data in the Waitaki Basin, New Zealand New Zealand Journal of Ecology (open access PDF)
  • Dowding & Moore (2006) Habitat networks of indigenous shorebirds in New Zealand,  SCIENCE FOR CONSERVATION 261 (DOC open access PDF part 1 and PDF part 2)
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