Kea


kea

KeaNestor notabilis Scientific name definitions

  • EN Endangered
  • Names (14)
  • Monotypic

dull blue; underwing-coverts reddish orange with yellow barring and notching to bases of undersides of flight-feathers; lower back to uppertail-coverts dull reddish, scaled black; tail above bronze green with dark subterminal bar, below dull yellow with dark subterminal bar and buffy tips. Female slightly smaller, with shorter, less curved bill. Immature has yellowish crown, yellow cere 

Systematics History

Monotypic.

Subspecies

Monotypic.

Distribution

Mountains of South I, New Zealand.

Habitat

Wooded valleys and Nothofagus forests bordering subalpine 

scrublands at 600–2000 m, occupying the upper scrub and grassland zones in summer, moving higher for berries in autumn before descending below the timberline in winter.

Movement

Juveniles form wandering flocks in autumn.

Diet and Foraging

Changes through year. In Jan birds feed on flowering mountain flax (Phormium colensoi), rata (Metrosideros) and other trees and shrubs, then berries of snow totara (Podocarpus nivalis) from late Jan to coming of snow.

Other non-seasonally grouped foods include fruits of Coprosma ciliataCyathodes fraseriMuehlenbeckia axillarisPentachondra pumila and Astelia nervosa, and leaves of Senecio scorzoneroides. Birds also take flesh and bone-marrow from carcasses and scavenge on rubbish dumps .

Stick-tool use to retrieve food rewards has been described for birds in captivity .

Sounds and Vocal Behavior

The commonest call  is a long and loud, descending nasal cry, which may be quavering and burry “kree-ee-ah-ah-ah” or more piercing, smooth and continuous “keeeeeaaaa”  . Also a variety of more quiet contact calls, mostly nasal and whining.

Breeding

Chiefly Jul–Jan, although recorded at all times of year except late autumn. Nest in crevice under rocks or in tree roots, or in hollow log. Eggs 2–4; incubation lasts 3–4 weeks; nestling period 13 weeks. Young males appear to disperse from natal area, while young females remain; however, mortality in male birds appears to be very much higher, since despite polygynous mating system there generally appears to be a surplus of females, not males. As few as 10% of adult males may breed in any given year, this in part due to polygyny by dominant male birds.

Conservation Status

 

ENDANGERED. CITES II. Restricted-range species: present in South Island of New Zealand EBA. Estimating Kea population size is difficult due to their extensive range, rugged terrain, low population density, cryptic behaviour of adults and flocking behaviour of juveniles .

A conservative estimate of one adult female per 2000 hectares of forest gives a global population of 4000 mature individuals . Total population estimated very crudely at 1000–5000 birds around 1985, based on an assumed and unsupported density of 2–10 birds/84km², but other evidence suggesting 30·5 birds/84km² indicates possibly 15,000 birds, 1992; however, if Keas show higher densities around car-parks 

 refuse dumps and ski resorts then this figure may be far too high. Populations appear to be in decline, with population densities falling markedly in some areas  .

Once seriously persecuted in the belief that birds kill sheep, with 150,000 culled between the late 1860s and early 1970s  (including 6819 killed in the years 1943–1946) during a government-sponsored control scheme through payment of a bounty; now established that attacks on living sheep are extremely rare and only involve already injured or diseased animals.

Stoats now appear to be a major predator . Kea appears to be an essential species for seed dispersal in New Zealand alpine ecosystems, as it consumes more fruit and disperse more seeds than all other bird species combined and is the only one making frequent long-distance flights within and between mountain ranges . Considered ‘Nationally Endangered’ in New Zealand .

 


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