This book is concerned with the stability and motion of flexible structures surrounded by a flowing fluid. Much of the available literature is concerned with linear concepts and models. Recent work has begun to consider the limitations and extensions of such models. Here special emphasis is given to larger motions where nonlinear effects are important. Buckling (or divergence) static equilibria, limit cycles and flutter oscillations are considered in some depth. Experienced practitioners and scholars as well as those students aspiring to a research career will find the book of interest.