Individual study: Rescue of the functionally extinct population of the Norfolk Island boobook Ninox novaeseelandiae undulata by the introduction of male N. n. novaeseelandiae from New Zealand
Olsen P.D. (1996) Re-establishment of an endangered subspecies: the Norfolk Island boobook owl Ninox novaeseelandiae undulata. Bird Conservation International, 6, 63-80
This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.
A study on Norfolk Island, Australia (Olsen 1996), found that the last remaining Norfolk Island boobook Ninox novaeseelandiae undulata (a female) paired with one of two male boobooks N. n. novaeseelandiae introduced from New Zealand in 1987 (the other disappeared shortly after release). The pair attempted unsuccessfully to breed in 1988 and 1991-3 but succeeded in 1989 and 1990, and fledged a total of four young. Two of these subsequently bred successfully themselves in 1993 and 1994, increasing the population to eleven birds, all alive in 1995.