Warblers are "tunnel fliers." Because they live in the woods, they tend to fly toward a light spot. This one, being new in the neighborhood, was particularly unaware of windows. I can't easily tell you what kind of warbler it is. Bill knew it instantly. The name included "green," "yellow," and "throat." But I can't say in exactly what order. Peterson's Field Guide has a section for "Confusing Fall Warblers." That's close enough for me.
Anyway, B wanted to be sure the cats didn't hurt it. She guarded it for a while, then finally picked it up. It waited long enough for me to get my camera. But when someone suggested getting a box to let it rest in, it took off.