Are Owls Nocturnal Or Diurnal? Their Behavior Explained DiscoverAnimal Zoid Editorial Team 0 Are Owls Nocturnal Or Diurnal? Their Behavior ExplainedOwls are typical birds that can be found in any environment of the world. Around 250 species of owl live in the world; each species differs by size and environmental conditions. The owls belong to the bird group Strigiformes.