Stewart Island robin
| South Island robin | |
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| South Island robin (Petroica australis) | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Passeriformes |
| Family: | Petroicidae |
| Genus: | Petroica |
| Species: | P. australis |
| Binomial name | |
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Petroica australis Sparrman, 1788 |
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The South Island robin (Petroica australis), is a sparrow-sized bird found only in New Zealand, where it has the status of a protected endemic species. The birds are sparsely distributed through the South Island and Stewart Island/Rakiura, although the distribution is not continuous. The nominate, and the Stewart Island robin (P. australis rakiura) are the two subspecies. The species is closely related to the North Island robin (formerly P. australis longipes, now considered a distinct species), and also to the extremely rare black robin (P. traversi) of the Chatham Islands.
The South Island robin is a small passerine, 10–18 cm in length and weighing around 35 g. North Island robins do resemble both females and juveniles of the South Island robins, as well as all the Stewart Island robins, which can sometimes make it difficult to distinguish between the three. The females and juveniles within a particular group of robins look similar to each other, although newly independent juveniles may not yet have the more lightly coloured breast patch. However, North Island males are almost black with a white spot just above the beak as well as the greyish-white lower breast. Females and juveniles are greyer with more variable pale patches on their breasts and throats. South Island males are dark grey except for the distinct yellowish white lower chest, while females and juveniles are again lighter grey with a less distinct breast. Finally, Stewart Island robins look similar to North Island robins (males and females).
New Zealand robins are relatively long-lived; life-spans of at least 14 years have been recorded in the wild.
The South Island robin has two subspecies: P. australis australis, the nominate form, and P. australis rakiura, the Stewart Island robin. These subspecies do not overlap in distributions. The North Island robin (P. longipes), the tomtit (Petroica macrocephala) and the black robin (Petroica traversi) in the Chatham Islands are closely related species. P. traversi seems to be a Chatham Island derivative of P. australis, although the position of the most recent common ancestor has yet to be determined. The family Petroicidae of Australo-Papuan robins has a total of 44 species in Australia, New Zealand, and New Guinea.
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