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Arredondo estimated the height of Ornimegalonyx to have been 1.1 m (3 ft 7 in) tall. [4] [5] It had very long legs for its size, but was bulky overall and probably short-tailed. Its body mass in life is initially estimated to have been approximately 30 kg (66 lb), [6] but later studies suggest a mass of 9 to 13.5 kg (20 to 30 lb).
Length averages 22 cm (8.7 in), wingspan 55 cm (22 in), and weight 143 g (5.0 oz). Weight ranges from 88 to 220 g (3.1 to 7.8 oz). [3] Females are larger than males and northern populations are notably larger than southern populations. [4] Adults are larger than whiskered screech owls, with larger feet and a more streaked plumage pattern.
The wingspan can exceed 152 cm (5 ft 0 in), but averages 142 cm (4 ft 8 in) for females and 140 cm (4 ft 7 in) for males. The adult weight ranges from 580 to 1,900 g (1.28 to 4.19 lb), averaging 1,290 g (2.84 lb) for females and 1,000 g (2.2 lb) for males. [5] The males are usually smaller than females, as with most owl species. [3]
Eggs are 6.2 cm (2.4 in) long and 4.9 cm (1.9 in) wide and are thus similar in size to Siberian eagle-owl eggs. The males provide food for the incubating female and later the nestlings. The incubation period is about 35 days and young leave the nest within 35–40 days but are often fed and cared for by their parents for several more months.
Midsized by screech-owl standards, these birds are stocky, short-tailed (tail averages from 6.6 to 8.6 cm (2 + 5 ⁄ 8 to 3 + 3 ⁄ 8 in) in length) and broad-winged (wing chord averages from 14.5 to 17 cm (5 + 3 ⁄ 4 to 6 + 3 ⁄ 4 in) in length) as is typical of the genus.
The flammulated owl is similar in appearance to the western screech owl, but is only about one-quarter the mass, lacks large ear tufts (but has small ear tufts that are barely visible), and has dark eyes and a different voice. The elf owl is smaller and the mountain pygmy owl is about the same size. The call is a series of relatively deep ...
[4] [5] The Ural owl is a rather large species. Full-grown specimens range in total length from 50 to 64 cm (20 to 25 in), which may render them as roughly the eight longest owl species in the world (though many owls are heavier on average). [5] [12] [13] [14] Wingspan can vary in the species from 110 to 134 cm (3 ft 7 in to 4 ft 5 in).
The Eurasian pygmy owl (Glaucidium passerinum) is the smallest owl in Europe. It is a dark reddish to greyish-brown, with spotted sides and half of a white ring around the back of the neck. [ 3 ] This species is found in the boreal forests of Northern and Central Europe to Siberia.