area in 2001; this operation successfully removed what was estimated to be the world's densest population of Norway rats (200,000) from Campbell Island and it was officially declared rat free in 2003. Fifty Campbell teal, a mix of captive-bred and wild-acclimatised animals (from Codfish), were reintroduced to Campbell Island in mid-2004, after an absence of more than a century. Subsequent monitoring in 2005 has shown that the majority of these birds are now thriving in their ancestral homeland. By 2011 the species has firmly been returned to Campbell Island, resulting in a reclassification of its threat status to endangered, and vulnerable again in 2020. References External links BirdLife International – "Campbell island teal can go home" BirdLife International – Species Factsheet TerraNature – Campbell Island teal Campbell teal Birds of the Campbell Islands Campbell teal Campbell teal Endemic birds of New Zealand