The plights of the world's threatened birds show the value of investing in conservation, according to campaigners.
One in eight of the world's birds is currently considered threatened.
A report by the Birdlife Partnership links continuing declines to deteriorating biodiversity, but it also highlights successfully protected species and habitats.
Conservationists suggest this shows how the estimated $80bn (£50bn) price tag of conserving nature is worthwhile.
Last year, scientists suggested it would cost about $5bn to reduce the extinction threat for all threatened wildlife, and up to $76bn to maintain a global network of protected areas.
"The total sums may sound large, but they are small in terms of government budgets, and they should be seen as investments, not bills," said Dr Stuart Butchart, Birdlife's head of science.
"Saving nature makes economic sense because of the payback in terms of services and benefits that people receive in return, from mitigating climate change to pollinating crops."