Some ornithologists believe that many species of songbirds are threatened by deforestation  Yet they also claim that, despite recent reforestation, matters continue to worsen, since it is fragmentation of forest rather than reduction of forest size that endangers songbird species
The introduction of open spaces and corridors in forests reduces the distance of songbird nests from unforested areas and thus reduces the songbirds' natural shield from predators
It is used as evidence that various species of songbirds will continue to be threatened with extinction.