Pennsylvania's state tree, the Eastern Hemlock, is under attack by the hemlock woolly adelgid, an introduced forest insect pest. The woolly adelgid is weakening and killing hemlocks across much of the southeastern half of the state and is spreading farther west and north year by year. Hemlock is an important forest tree that creates a special microclimate unmatched by any other tree in the state, thereby providing nesting habitat for several specialized breeding bird species. Loss of this ecologically unique component of Penn’s Woods may negatively affect bird diversity in many areas. The 2nd PBBA will attempt to document changes in bird distibutions affected by hemlock loss, as well as to track the problem itself by including a special hemlock habitat column on field cards. With the expected number of 2nd PBBA participants, we can bring in an exceptional amount of information concerning our state's natural treasure, the Eastern Hemlock.