Last spring, I had many days in a row (starting in mid April) of seeing black-crowned night-herons roosting by the river in the stand of trees near the BU rotary. This year I saw them for the first time on April 28th, and saw five at once on May 1st. Then I had about a week of seeing them consistently, and as the trees leafed out, more and more days have come when I haven't seen one at all - it's tricky for me to tell if I'm just worse at seeing them, but I think they've been less consistent in this spot.

I haven't had a classic early-May see-all-the-warblers day yet, largely for lack of getting to a good spot. I have been carrying binoculars everywhere I go.