Current data suggests that the distribution of OSFL in New Hampshire is gradually retracting to the north. The species is all but absent from areas it formerly occupied in the southwestern portion of the state, and even where it was detected it may not occur regularly. In central New Hampshire, declines in southern areas are more obvious than in the north, but there are signs of losses even in formerly-occupied areas in the southern White Mountains. Localized losses are also possible in the northern third of the state, although in general the range here has not changed significantly.
Project Report: Assessment of Olive-sided Flycatcher Status and Distribution in NH 2016
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