A book that describes what kangaroos do and offers unusually beautiful pictures of them doing it. One old male bending forward while scratching his back looks like nothing else found in nature- -except maybe a curmudgeonly old baseball manager with arthritis in the late innings of another losing game (in fact, baseball players would appear to be the only animals who scratch themselves as much as kangaroos do--bellies, underarms, Iwago captures every permutation of scratching). At other times, they look preternaturally graceful and serene. Some of Iwago's (Mitsuaki Iwago's Whales, not reviewed) photographic compositions flirt with anthropomorphism and slyly play to our urge to see ourselves in the animals. But kangaroos are so singular that there's always something about the cant of a head or the drape of a limb that makes you think you flatter yourself that there is any kinship. They remain wondrously different.