New Zealand has the fifth largest proportion of birds at threat of extinction globally, in the grimmest release of The State of the World's Birds report yet.
Globally, around half of all bird species are declining, one in eight are threatened, and 187 species are believe to have vanished since the 1500s.
BirdLife International releases the four-yearly report, its chief scientist Dr Stuart Butchart spoke to Guyon Espiner.
