New Zealand rock wren

The New Zealand rock wren, scientific name Xenicus gilviventris, is a small passerine in the family Acanthisittidae, endemic to the South Island of New Zealand and now restricted to alpine and subalpine zones at 900 to 2,500 meters in the Southern Alps, the Tasman Mountains of Northwest Nelson and the Victoria Range of Westland, making it New Zealand's only truly alpine bird. It measures about 9 centimeters long, with males weighing around 16 grams and females around 20 grams; males show greenish plumage with yellow flanks and pale underparts, while females are browner, and both have rounded wings and long legs that suit hopping and running more than flying. The IUCN lists it as Endangered, with populations declining mainly from predation by introduced stoats and mice; the Murchison Mountains population alone declined by 44 percent over two decades between 1912 and 2005 measurements. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/