Solved

Thanks to the kind people at Mass Audubon, I'm now able to put a name to the mystery bird pictured in the previous post: a northern parula.

Warblers appear

After the hermit thrushes came and went -- in surprising numbers -- a bit of a migratory lull followed.  We had a few native sparrows, and some woodpeckers, but the wave of warblers had yet to hit.  Then, this past week, on the 27th of April, the first of them appeared, in the shape of a black-and-white warbler.  Catbirds are back, too -- a quartet at first, and now a lone settler.  A couple more days of nothing, then today, two more black-and-whites, along with an ovenbird (possibly), and a black-throated blue warbler (I think). Identification is often difficult with these skittish things up in the trees.  And sometimes, even when I get a halfway decent picture, I still can't identify the bird.  Case in point...