Previously classified as an Endangered species by the IUCN, recent research shows that its numbers are decreasing more and more rapidly, and it is on the brink of extinction. It was consequently uplisted to Critically Endangered status in 2008.
Today, two small sub-populations are extant on the small satellite islets of Champion and Gardner-by-Floreana. They are due to be re-introduced as a third, possibly hybridized population on Floreana (due to genetic compatibility and hybrid viability revealed through analysis of the Darwin-Fitzroy collections) 
(From Wikipedia, October 2013)