Females are larger and heavier than males. For example, in Minnesota male boreal owls weigh approximately 110 grams, but the females are considerably larger, averaging 160 grams in weight. Distribution & Subspecies. Habits: A nocturnal Owl, also unsociable.
Wingspan: 20-24 in (50-62 cm) Color: Brown on the top with white spots on the shoulders; the underparts are whitish with streaks of rust; the eyes are yellow and the beak is light yellow; juveniles are chocolate brown. Weight: Males 90-115g (3-4 oz), Females 120-195 g (4-7 oz) Wingspan Both: 55-62 cm (22-25 in) BOREAL OWL RANGE: A northern owl; interior Alaska, Canada, U.S. Rocky Mountains, south to New Mexico; also northern Europe and Asia BOREAL OWL HABITAT: Boreal forests, muskeg, subalpine forests BOREAL OWL DIET: Generally, the female owls are heavier than the male ones with the body weight that ranges from 126 grams to 194 grams (0.1 kg to 0.2 kg), whereas the male ones have a body weight between 90 grams and 113 grams (0.09 kg and 0.1 kg).
Like most raptor species, boreal owls exhibit pronounced sexual size dimorphism, with the females being considerably larger than the males. Weight 90-194g. The Boreal Owl has a brown color body, with white flecking on its shoulders and it has no ear-tufts.
The Boreal Owl inhabits the northern coniferous and mixed deciduous boreal and subalpine forests of North America. Sexual Dimorphism: Females much larger than males. In Colorado they were found to occur between 9,100 and 10,400 ft. elevation although the highest densities were above 9,800 ft. in mature spruce-fir forests where there were numerous subalpine meadows and high populations of red-backed voles. Distribution (underline = this CommonName used here) Y: Common: S: Scarce: R: Rare: N: Not Seen Adult males are territorial, however, territories are small.