An indifferent-looking introduction to the evolution of flying animals which nevertheless pulls its weight's worth of striking facts. Using airplane design for comparison, Dean talks about the differences between the soaring eagle and the hovering hummingbird (the latter achieves lift without forward thrust); shows how the wings of different birds are similar to those of planes which do the same kinds of flying; reviews the change, in insects, from fixed to movable wings. Not as systematic as Kaufmann's excellent Birds in Flight (1970), but with easygoing, incidental appeal for slightly younger readers.