Gallop! is written for ages 4 and up, but those tykes will be lucky if they can get this book away from the grown-ups. "Scanimation," a brand-new technology, is used to create page after page of black and white pictures that-without batteries-move in the most magical way. The horse does gallop, the cat does spring, and the chimp swings like a champ. Savvy readers will be reminded of Eadweard Muybridge's photography; kids will simply love making an eagle soar forth . . . and back . . . and forth. The clever rhyming text is a plus-and the sturdy binding is a necessity as this book is truly a page-turner that will be opened again and again.