Northern Boobook
Ninox japonica
Ninox japonica is a hawk owl species with a body length averaging between 29 and 33 cm and a wingspan of approximately 60 to 70 cm wide. Current knowledge on the species shows no sexual dimorphism and an average weight of approximately 168g. The northern boobook has a hawk-like appearance and its subspecies are practically indistinguishable. Individuals of the species will have a brown back and wings with lighter brown horizontal streaks on the tail feathers. The neck, crown and face of this bird are slightly more greyish brown aside from a small white patch above the beak. Voice: Northern boobooks vocalize through a sequence of deep ho-hos and this behavior is specific to breeding individuals during their reproductive periods. Correspondingly, the vocalization of N. japonica is seldom heard in regions where it is migrant or a winter resident.
ID text from Wikipedia, CC BY-SA 4.0
Northern Hawk-Owl
Surnia ulula
Male northern hawk-owls are generally 35–42.5 cm (13.8–16.7 in) long, and weigh about 300 g (11 oz). Females are slightly bigger with a length of 37.2–44.7 cm (14.6–17.6 in) and a weight of about 340 g (12 oz). Both male and female have similar wingspans of about 69–82 cm (27–32 in). The plumage is relatively dark brown with an off-white spotting pattern on all dorsal parts of the body with the exception of the back of the neck which boasts a black v-shaped pattern. The underbelly is generally white or off-white which continues to the toes with brown bands on the breast and stomach. Voice: Various calls are used by the different sexes in different situations. When attracting a mate the male usually lets out a rolled whistle of ulululululululul and a sound similar to tu-wita-wit, tiwita-tu-wita, wita, when perching at a potential nest site. The female's call is usually less constant and more shrill.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Northern Boobook and Northern Hawk-Owl.