There are now only 21 species of native forest birds remaining out of an original total of 46 or more. (reviverestore.org)
The results also suggest that restoring forests is likely to be most effective for forest birds if such efforts are performed in the vicinity of primary forest. (sciencedaily.com)
It found that 18 species of specialized forest birds sharply declined in areas with less than 21 to 40 % canopy cover. (coffeehabitat.com)