“Still, we had a lot of these hemlock-associated bird species hanging around. So on a local scale where we are managing, like in a national park, for example, if we can keep enough hemlocks alive, they don’t necessarily have to be that healthy. And if we have just a few hemlocks but we invest heavily in keeping them in good shape, that also is beneficial for keeping hemlock-dependent birds, at least on a very small scale.”

Read more: http://news.psu.edu/story/465520/2017/04/27/research/if-some-hemlock-trees-can-just-hang-birds-need-them-may-be-ok