Norfolk boobook mated with the female with the pair producing fledged chicks in 1989 and 1990. The original female disappeared in 1996 but, by then, there was a small hybrid population of about a dozen birds. These birds and their descendants continue to exist on the island. Norfolk boobook The Norfolk boobook ("Ninox novaeseelandiae undulata"), also known as the Norfolk Island boobook, Norfolk Island owl or Norfolk Island morepork, was a bird in the true owl family endemic to Norfolk Island, an Australian territory in the Tasman Sea between Australia and New Zealand. It is an extinct subspecies of the morepork ("Ninox
Australasian wren from such pairings. Males of several species pluck petals of conspicuous colours and display them to females for reasons unknown. The song of fairywrens is pleasant and complex, and at least two species (superb and splendid) possess, in addition to the alarm calls common to – and universally understood by – most small birds, another vocalization used when confronted by predators. This, termed "Type II Vocalization," is song-like and used when confronted by calling butcherbirds, and sometimes other predatory birds. Its purpose is, however, unknown; it does not seem to be a warning call. Australasian wren The Australasian wrens are