Red bird came all winter / firing up the landscape / as nothing else could. So begins Mary Oliver's twelfth book of poetry, and the image of that fiery bird stays with the reader, appearing in unexpected forms and guises until, in a postscript, he explains himself: "For truly the body needs / a song, a spirit, a soul. And no less, to make this work, / the soul has need of a body, / and I am both of the earth and I am of the inexplicable / beauty of...