Ninox is a genus of true owls comprising 36 species found in Asia and Australasia. Many species are known as hawk-owls or boobooks, but the northern hawk-owl is not a member of this genus.
Ninox
Seram boobook (N. squamipila) (left); Timor boobook (N. fusca) (right)
The true owls or typical owls are one of the two generally accepted families of owls, the other being the barn owls (Tytonidae). This large family comprises 230 living or recently extinct species in 24 genera. The typical owls have a cosmopolitan distribution and are found on every continent except Antarctica.
True owl
Cross sectioned great grey owl specimen showing the extent of the body plumage, Zoological Museum, Copenhagen
Skeleton of a true owl (Strigidae)
Spectacled owl (Pulsatrix perspicillata)