Volume 5 includes the orders Strigiformes, Caprimulgiformes, and Apodiformes. Families covered are Tytonidae (Barn Owls); Strigidae (Typical Owls); Steatornithidae (Oilbird); Podargidae (Frogmouths); Aegothelidae (Owlet-nightjars); Nyctibiidae (Potoos); Caprimulgidae (Nightjars); Apodidae (Swifts); Hemiprocnidae (Tree-swifts); and Trochilidae (Hummingbirds). The book includes a foreword on risk indicators and status assessment in birds.