Long billed wren (New Zealand)

The long-billed wren (Dendroscansor decurvirostris) was a species of New Zealand wren (family Acanthisittidae) endemic to the South Island of New Zealand. It was the only species in the genus Dendroscansor. The long-billed wren was a small bird with stout legs and tiny wings. Its reduced sternum suggests that it had weak flight muscles and was probably flightless, like the recently extinct Stephens Island wren. Its weight is estimated at 30 g, which makes it heavier than any surviving New Zealand wren, but lighter than the also-extinct stout-legged wren. The bill of this species was both long and curved, unlike that of all other Acanthisittid wrens.

The species is known only from subfossils at four sites in Northwest Nelson and Southland; it seems to have been absent from the North Island and eastern South Island. The holotype was collected in 1986 from Moonsilver Cave, on Barrans Flat, near Takaka. It is the rarest fossil wren from New Zealand, and presumably was the least common species when it was still extant. It is thought to have lived in high-altitude shrublands (like the surviving New Zealand rock wren) and perhaps montane southern beech forest.

The long-billed wren was extinct before the arrival of European colonists and explorers in New Zealand. It was among the first wave of native bird species to go extinct after the introduction of the Polynesian rat. Like many New Zealand species, the long-billed wren presumably had few defences against novel predators such as the rat.