Daisy inspects the spicebush for spicebush swallowtail caterpillars. Apparently spicebush, a small tree with spicy-smelling (imagine!) leaves is the only larval food for the grand, black and blue, velvety spicebush swallowtail butterfly. Hunting for the caterpillars is fun and satisfying for babies, because each caterpillar chooses a leaf to hide on, folds it over, and keeps it shut with a little flexible webbing. Once you spot a folded-up leaf, your mother gently pries it open, and there is the spicebush caterpillar, bright green with his big fake eyespots, looking up at you.