Like everything else in the garden, the lilacs have bloomed early this year. And for the first time ever, I saw butterflies lighting on them this afternoon. Lots and lots of butterflies. I didn't have my camera, and when I went back this evening to see if they were still there, the light was dim. And it was windy. So the lilacs look dramatic, but it was hard to capture the butterflies.
I think, from using this butterfly identification page, that the butterflies are Vanessa atalanta, aka Red Admiral. They are very busy!