Yesterday morning I returned to the John A. Phillips Open Space Preserve for the third time this year to walk the trails and see if any new migrants had moved in. As I mentioned in previous posts on this site, it is part of the Spotswood Outlier, a portion of Pine Barrens forest that lies 20 miles north of the main body of New Jersey's Pine Barrens. The preserve is heavily forested, mostly with Pitch Pines, though there is a substantial section of oak-beech forest. As one would expect in this sort of habitat, there were many singing Pine Warblers. I also heard a surprisingly high number of Ovenbirds (my first for the year), many Yellow-rumped Warblers, and several Black-and-white Warblers (another year first). One Common Yellowthroat was singing in a swampy area. What the warblers lacked in diversity, they made up for in sheer numbers. I heard Ovenbirds singing during my entire walk.