The rediscovery of the Bermuda petrel’s nesting grounds in 1951 enabled concerted conservation efforts, and since 1961, all of the breeding sites have been intensively managed by a conservation officer employed by the Bermuda Government Ministry of the Environment. Periodic invasions of rats are controlled by trapping and baiting with anti-coagulant poisons, and nest competition with tropicbirds has been eliminated by the installation of wooden entrances, which exclude the larger tropicbirds. In addition, man-made concrete burrows have been provided on the level tops of the islets to accommodate the cahow population increase. Furthermore, since 1962, the six hectare, soil-covered Nonsuch Island has been restored and kept predator-free as a much larger future home for the expanding population (7).
Between 1961 and 2010, the breeding population has grown from a low of 18 pairs to 95 pairs, and fledgling production has risen from 8 per year to 50 per year (7). From 2005 to 2008, 104 fledglings were translocated from the smaller islets to man-made burrows on Nonsuch Island (7), resulting in the establishment of a colony of 7 pairs by 2010 (2). These success make the conservation of the cahow one of the most successful endangered species recovery programs in the world (7).