“A World on the Wing is littered with such wonders: birds who can pack on fat without obesity’s downsides, add muscle when and where it’s needed, and burn fuel with extraordinary efficiency, qualities that would make endocrinologists, bodybuilders and weight loss gurus salivate. Migrants can even “see” the Earth’s magnetic field via the quantum entanglement of the electrons in their eyes, an evolutionary trick that is the stuff of science fiction.” --- Christian Cooper, a board member of the NYC Audubon and the author of the forthcoming memoir “Better Living Through Birding.”