Bird of prey "Accipitres", subdividing this into four genera: "Vultur" (vultures), "Falco" (eagles, hawks, falcons, etc.), "Strix" (owls), and "Lanius" (shrikes). This approach was followed by subsequent authors such as Gmelin, Latham, and Turnton. Louis Pierre Veillot used additional ranks: order, tribe, family, genus, species. Birds of prey (order Accipitres) were divided into diurnal and nocturnal tribes; the owls remained monogeneric (family Ægolii, genus "Strix"), whilst the diurnal raptors were divided into three families: Vulturini, Gypaëti, and Accipitrini. Thus Veillot's families were similar to the Linnaean genera, with the difference that shrikes were no longer included amongst the birds of prey. In addition
The Bird of Peace choosing (intended as gifts to heads of state for his upcoming NATO tour), he expressed fatigue toward doves and hawks. Helen suggested finding a new bird to be an updated symbol of peace, one with less political baggage than say the dove, to which Nixon said "That's a fine idea." Helen subsequently wrote to ornithologists around the world, seeking suggestions for what that new peace bird ought to be. Among the responses, and her own research, both gathered over several months, the mute swan was most mentioned, frequently having been cited for its tranquility, even over the traditional dove. Helen