A small flock of these Yellow-rumped warblers (Setophaga coronata) were zipping in and out of trees, dining on what others might find unpalatable: poison ivy berries.
Meanwhile, this rather serene-looking female found a quieter spot nearby to take a brief break from the action.
Update: About a week after the first group was spotted, more warblers were feeding primarly on juniper berries.
As before, some flew into a nearby tree for a rest, or perhaps to sample the larger red fruits there. Here the eponymous rump (good name for a pub) is visible.