Overview
The Chatham Robin (Petroica traversi), commonly known as the black robin, is celebrated throughout international biological history as one of the most astonishing conservation comeback stories ever recorded. Endemic to the windswept Chatham Islands archipelago east of New Zealand, this plump, all-black songbird was reduced to a global population of just five individuals—and a single fertile female named ‘Old Blue’—in 1980 before legendary wildlife interventions saved the species from inevitable extinction.
Biology and Physical Characteristics
Petroica traversi is a compact, chunky passerine adorned in uniform, velvety brownish-black plumage with a slight charcoal sheen. Its eyes are large, dark, and expressive, assisting foraging under dim scrub canopies. It features relatively long, delicate black legs and slender toes adapted for hopping across the forest floor, flipping dead leaves in search of hidden invertebrates. Unlike many of its Australian and New Zealand robins, it has completely abandoned bright breast coloration in favor of cryptic melanism.
Behavior and Ecology
Territorial and monogamous, Chatham robins establish lifelong pair bonds and defend well-defined forest territories year-round. They forage primarily on or near the ground, gleaning beetles, grubs, spiders, and amphipods from the thick leaf mold beneath coastal olearia and akeake trees. They are exceptionally confiding birds with minimal innate fear of humans, a trait developed in the absence of native mammalian predators that left them vulnerable when exotic rats and cats were introduced.
Conservation and Human Impact
Downlisted from Critically Endangered to Endangered, the Chatham robin now numbers over 300 individuals across Rangatira and Mangere islands. Its miraculous recovery was engineered by the New Zealand Wildlife Service led by Don Merton, who pioneered cross-fostering techniques: taking eggs laid by ‘Old Blue’ and placing them into the nests of Chatham Island tomtits to raise, stimulating Old Blue to lay successive replacement clutches. Both sanctuary islands remain strictly protected, predator-free nature reserves.
Interesting Factoid
Every single living Chatham robin in existence today is a direct descendant of one legendary matriarch bird named ‘Old Blue,’ who lived to an extraordinary age of 14 years!
Last updated: October 2026