In this chapter insect flight is discussed using concepts presented in previous chapters. In particular, the structure of insect wings is described and the hovering flight of insects is examined. The power required for hovering and the energy expended in insect flight are calculated. The remarkable aspects of insect flight are in part due the elastic rubber-like properties of resilin, a material contained within the wing structure. During the upstroke of the wing the resilin is stretched. The energy stored in the stretched resilin is relealsed in the downstroke. The magnitude of the stored energy is calculated using Young’s modulus. Exercises are provided to expand the understanding of the concepts presented.