The glaucidium passerinum (scientific name: glaucidium passerinum) is a bird of the family Owls and the genus Grematus. The flower-headed grebe is a small owl with a body length of 15–23 cm, an inconspicuous face plate and no ear tufts; the upper body is grayish brown, densely covered with white spots and transverse spots; the hind neck has an inconspicuous white collar and the lower body is white with brown stripes.
China is distributed in Tianjin, Hebei, Inner Mongolia, Heilongjiang, Xinjiang and other places, of which heilongjiang is a resident bird, in Hebei, Tianjin is a winter migratory bird, are extremely rare.
It inhabits coniferous and mixed coniferous and broad-leaved forests, but is also found in open areas and birch forests. It is predominantly nocturnal, mostly hiding in the depths of dense forests during the day, but sometimes active and foraging during the day. The perch often stands on a tall branch and looks out, and constantly raises its tail feathers upwards. Fierce in temperament, with a strong mouth and claws, it can hunt prey that is much larger than itself. In winter, there is also the habit of storing food, often storing the captured food in tree holes. It feeds mainly on rodents, but also on lizards, small birds and insects. When flying, the up and down waves rise and fall like woodpeckers. Resident birds, rare in number, are not easy to see in the wild.
The breeding period of the flower-headed partridge is from May to July. Nests are usually nested in tree holes, but also nested between large branches. Each clutch lays 4-6 eggs, occasionally as many as 8-9 and as little as 3. The eggs are white. The incubation of the eggs is undertaken by the female and the incubation period is 28-29 days.