You can determine the lifestyle of a given owl species based on the color of their eyes. If the irises are dark, it is highly likely that the owner leads a nocturnal lifestyle. Owls that exhibit diurnal activity have yellow or orange irises. This is the lifestyle of the Pearl-spotted Owlet (Glaucidium perlatum), visible in the photo, which can boast vibrant yellow eyes.
Okavango Delta, Botswana
FE 200-600mm F5.6-6.3 G OSS
600mm ƒ/6.3 1/1000 ISO 250