They’re nasty in your stomach but lovely in your backyard. Attract butterflies with tips from Summer: A User’s Guide, by Suzanne Brown (Artisan, $20, ww.amazon.com). Butterflies need warm bodies to fly, so create a sunny basking place with flat rocks, then surround the space with nectar-rich flowers, like asters, and a saucer of water. Build it. They will come.