Karure, the New Zealand’s black robin (petroica traversi) is an amazing story of how a species on the brink of extinction, with one breeding pair left, has now recovered to approximately 350 individuals in 2025. All of these individuals are descended from one female called Old Blue.
(Text from: https://www.sciencelearn.org.nz/images/old-blue-the-story-of-the-black-robin )

