sentences:  The world population was roughly 70 breeding pairs in 1937 and their habitat was declared a reserve in 1954.The population fluctuated in the 1980s, with only 40 breeding pairs in 1982, rising to 80 pairs in 1987 and a high of 94 pairs in 2010.A second wild population of about 20 birds was discovered in 1999 living on Western Reef off Chatham Island, but it gradually declined, and the last bird was taken into captivity in 2003.