THE SOUTHERN BROWN KIWI

 

The southern brown kiwi, tokoeka, or common kiwi^[3] (Apteryx australis) is a species of kiwi from South Island of New Zealand. Until 2000 it was considered conspecific with the North Island brown kiwi, and still is by some authorities.

 Apteryx australis is based on Greek and Latin. Apteryx means "A-" without "pterux" wings, and "australis" from "auster" the south wind, and "-alis" relating to.^[6] The southern brown kiwi belongs to the kiwi family and it is a ratite, and a member of the order Apterygiformes. Like all ratites, its sternum has no keel, it is flightless, and it has a distinctive palate.^[3]

The holotype specimen of Apteryx australis Shaw (Nat. Miscell., 24,1813, pl1057) is held in the collections of National Museums Liverpool at World Museum, with accession number NML-VZ D180. The specimen was collected by Captain Barclay at Dusky Sound, South Island, New Zealand and came to the Liverpool national collection via the 13th Earl of Derby's collection which was bequeathed to the people of Liverpool.:

 

A specimen described as Apteryx occidentalis in 1893 is often considered a junior synonym of Apteryx owenii, but a study in 2002 indicated this may be a hybrid between Apteryx australis and Apteryx owenii.^[9]

It has no preen gland, and its feathers have no aftershafts and no barbules. There are large vibrissae around its gape, and it has no tail, only a pygostyle. It has a length of 45 to 55 cm (18–22 in) and the female weighs 2.1 to 3.9 kg (4.6–8.6 lb) and the male weighs 1.6 to 2.8 kg (3.5–6.2 lb). Its bill is long and slender with a slight down-curve. Like other kiwis it is nocturnal. The colour of its plumage is rufous with some streaking.^[3]

Southern brown kiwi communicate vocally to aid in defending their territory. They will also sing duets with each other, with the male shrill "kee-wee" or "kee-kee" and the females hoarse " kurr kurr".^[7] Males are more vocal and they both call in an upright position with their legs stretched out and their bill pointing up.^[3]

 The southern brown kiwi has a long slender bill with lateral nostrils at the tip, which helps give them their keen sense of smell. They utilise this, more than sight and sound, to forage in dirt for invertebrates, including earthworms, beetle larvae, snails, crayfish,^[10] spiders, centipedes, and orthoptera, as well as eels and amphibians.^[11] Its gizzard is weak, and underutilised due to the lack of plant matter. Its caeca are long and narrow and aid in digestion.^[3]

The southern brown kiwi, like all kiwi, has two functioning ovaries, however only the left oviduct functions, allowing eggs from both ovaries to pass through. It is a monogamous species and once paired up, they will defend their territories with warning calls. The size of their territory is between 4.9 and 43 hectares (12 and 106 acres). Nests are made in burrows, or sheltered beneath thick vegetation. The female lays 1–2 eggs, typically just 1, which the male incubates for 90 days. After a few days the chick will exit the nest and feed on its own, although it may stay around parents for a year. When not incubating eggs, they roost alone in sheltered places at ground level.^[3]

  

Southern brown kiwi live in the South Island and Stewart Island. On the mainland (South Island) they live in Fiordland and Westland. Their range is temperate and sub-tropical forests, grassland, and shrubland, the denser the better.^[3] They are widespread throughout Stewart Island where they also live on the sand dunes.^[8]

In 2000, after being recognised by IUCN, they were placed in the Vulnerable status group.^[2] They have an occurrence range of 9,800 km² (3,800 sq mi) and population of 27,000 was estimated in 1996.^[8] Brush-tailed possums, Trichosurus vulpecula, and stoats, Mustela erminea, will eat the eggs, while stoats and cats will eat chicks and juveniles. Adults are also under threat as dogs, ferrets, and brush-tailed possums, attack them and the juveniles. The Stewart Island population is stable due to the lack of these predators,^[2] however stoats may have colonised the island in 2000.^[8]

 In 2018 a drought caused a poor breeding season for Haast tokoeka and killed three chicks; six were airlifted to Orokonui Ecosanctuary near Dunedin, and then on to a "creche" on Rona Island in Lake Manapouri, Fiordland.^[13]

 

  

 

The distribution of southern brown kiwi 

 

 

 

 

 

 

THE MADAGASCAR KESTREL, MALAGASY SPOTTED KESTREL

 

The Malagasy kestrel (Falco newtoni), also known as the Madagascar kestrel, Malagasy spotted kestrel, Newton's kestrel, Madagascar spotted kestrel, katiti (Creole)^[2] or hitsikitsika (Malagasy), is a small bird of prey of the genus Falco. It is named after British ornithologist Edward Newton. It occurs in two subspecies on Madagascar and at Aldabra. The race from Aldabra is also called Aldabra kestrel (Falco newtoni aldabranus). Its closest living relative is the Seychelles kestrel; they were at one time considered conspecific. Their common ancestors appear to have diverged very recently, probably less than 1 million years ago during the Early or Middle Pleistocene. The Mauritius kestrel is more distantly related.(Groombridge et al. 2002)

It can reach a size of 30 cm. The wings are 180 mm to 195 mm at the males and 188 mm to 203 mm at the females. The males can reach a weight between 112 and 118 grams. The weight of the females is up to 128 grams. The head and the nape of the males is rufous grey with dark streaks. A dark moustachial streak running from the basis of the bill backwards to sides of the throat. The upperparts and the wingcoverts are chestnut with black spots. The uppertail coverts are grey with blackish spots. The long flight feathers are blackish brown, the inner webs are covered with white and chestnut spots. The underparts are whitish. The short flight feathers are chestnut coloured and dark banded. The chest, belly and underwing coverts are covered with black spots. The tail is grey coloured. It has six to seven narrow black bars and a broad subterminal bar. All feathers have white tips. In addition there is a rufous phase. At this morph the head and nape are almost black. Body and underwing coverts are dark chestnut brown with black streaks and spots. The throat exhibits a buffish-white hue. The underwing coverts are greyish white and spotted black. The head of the females is stronger chestnut coloured. The underparts are more spotted and the tail is brown with black bars. Both sexes exhibits a slate grey bill with a black tip. The cere is yellow. The legs are either yellow or bright orange (rufous morph). The juveniles are similar coloured as the females.

The Malagasy kestrel has a large range of occurrence and it is native to Madagascar, Mayotte, and the Comores. It is a breeding resident on Madagascar where it occurs in savannas and wetlands but also artificial landscapes in the vicinity of human settlements in altitudes from 0 to 2000 asl. It is uncommon in forests. The habitat of the Aldabra kestrel is the Aldabran Island of Grande Terre but there is also evidence for the island of Anjouan at the Comores.

The Malagasy kestrel usually nests on rock ledges, in buildings, in tree holes, or in the stick nests of other birds, such as the pied crow. Four to six eggs are laid, usually in September, and are incubated by the

 

 

Insects take up the majority of the Malagasy kestrel's diet, which are usually taken during flight, but it also occasionally eats small birds, frogs, and mammals, all of which are taken on the ground. It hunts from a low perch, hawking or hovering with the wing, at dawn or dusk.^[4]

 

 

 The Malagasy kestrel's call consists of a sharp scream of iitsi, kitsi, kitsi, kitsi or a loud repeated twitter. 

 

 

 

 

 

 

 

 

 

 

THE OKARITO KIWI

 

The Okarito kiwi (Apteryx rowi), also known as the rowi or Okarito brown kiwi, is a member of the kiwi family Apterygidae, described as new to science in 2003.^[3] The species is part of the brown kiwi complex, and is morphologically very similar to other members of that complex. It is found in a restricted area of the Ōkārito forest on the West Coast of New Zealand's South Island,^[4] and has a population of only about 600 birds.^[5]

The Okarito kiwi is a monotypic species, i.e. there are no recognised subspecies.^[4] The genus name Apteryx stems from the Greek "without wings".^[6] Originally assumed to be the same species as the Southern brown kiwi A. australis, DNA testing shows that the possible split off from this species was 8.2 million years ago, and the split from their closest relatives, the Northern Island brown kiwi A. mantelli was around 6.2 million years ago.^[7] This bird is a ratite and has similarities to the others (emu, ostrich, rhea, cassowary). Its sternum has no keel, its wings are minimal, and it has no preen gland. Its palate is also distinctive, and its feathers have no barbules or aftershaft. Other features that are similar to only the other kiwi is a weak gizzard and no tail, only a pygostyle.^[8]

The Okarito brown kiwi lives in the Okarito forest on the West Coast of New Zealand's South Island.^[4][9] On 29 June 2010, three breeding pairs were released onto Blumine Island as part of a breeding programme.^[10] A new population was established in the Omoeroa Ranges near Fox Glacier in late 2018.^[11] In 2021 signs of Rowi were detected in Ballyhooly Bush, remnant mataī forest on the Lower Whataroa River flats, 24 km from Ōkārito forest.^[12]

The female can lay up to three eggs, each in a different nest. Both the male and the female incubate the eggs. The egg is very large, as it weighs 20% of the female's weight (as in all kiwi). The eggs incubate for 75–85 days.^[13] Most pairs are monogamous throughout their lives.^[9]

The West Coast Wildlife Centre, at Franz Josef, is part of Project Nest Egg, breeding rowi.

The Okarito kiwi is currently classified as Vulnerable by the IUCN due to habitat loss and predation by introduced stoats.^[1] Conservation efforts such as Operation Nest Egg and the stoat control regime have been partially successful in restoring the rowi population. However, the rowi is still in a fragile stage of existence. Predation, mainly from imported animals such as stoats, is still the biggest threat to the rowi. The South Okarito Forest was designated a kiwi sanctuary in 2000.^[9]

 

 The West Coast Wildlife Centre in Franz Josef village operates a conservation programme as part of Operation Nest Egg. Eggs at risk of predation are removed, the chicks hatched in captivity, raised in a natural predator-free environment until old enough to fend for themselves, and then returned to the wild. The operation opened in 2010 and has been responsible for raising the wild population of rowi from just 165 ageing adults in the 1990s to 600 as of 2019.^[14] Surveys have ensured that there is no noticeable difference in behaviour between such birds and rowi growing up fully in the wild. The Wildlife Centre is the only place in New Zealand where one can see rowi in a nocturnal walkthrough area.^[15]