What does a crow look like?

Crows are 400 ~ 490 mm long; The body feathers are mostly black or black and white, and Kuroha has a purple-blue metallic luster; Wings are much longer than tails; Mouth, legs and feet are pure black; The distance from the nostril to the forehead is about 1/3 of the length of the mouth. The nose must be straight and reach the middle of the mouth.

Crows are distributed around the world several times. There are 7 species in China, most of which are resident birds, among which the bald-nosed crow, Western jackdaw in the west of Dawuli and the big-billed crow are more common. In the vast plains of China from east to northeast, bald-nosed crows nest in tall trees. They are all black, with no feathers behind their mouths and gray skin.

White-necked crows nest in tall trees from the southern plains of North China to the low hills, rarely forming groups, with black feathers and obvious white-collar belts. Western jackdaw in the west is a common crow in the vast mountainous areas and near mountainous areas in northern China. Its chest, abdomen and collar are white, and the rest are black. I like to build nests in cliff holes, tree holes and gaps in tall buildings.

Crows with large mouths breed in the vast mountainous areas south of northeast China, with large bodies, thick mouths and black bodies. Raven is the largest individual among crows, with a body length of about 600 mm and a black body. Most of the body feathers, wings and tail feathers have blue-purple or blue-green metallic flashes, and the mouth is very thick.

Extended data

Living habits of crows:

Living on the edge of a forest or cliff, digging and pecking in the wilderness is a powerful cluster. Except for a few species, they often nest in groups and wander in groups in autumn and winter. Complex behavior, showing strong intelligence and social activity ability. The singing is simple and rude. Omnivorous, many like carrion, which is harmful to seedlings and grain.

However, small vertebrates, locusts, crickets, scarabs and moth larvae are mainly fed during the breeding period, which is beneficial to farmers; Because they like to rot and peck at agricultural waste, they can eliminate the pollution of animal carcasses and purify the environment; Generally fierce and aggressive, they often prey on eggs and chicks in waterfowl and wading nests.

The courtship show in the breeding season is very complicated, accompanied by acrobatic flight. Males and females nest together. The nest is basin-shaped, woven with thick branches, reinforced with soil between branches, and the inner wall is lined with twigs, grass stems, cotton and linen fibers, animal hair, feathers and so on. Sometimes with a thick layer of horse manure. Each nest lays 5 ~ 7 eggs. Eggs are grayish green with brown and gray spots. Female birds hatch eggs, incubation period 16 ~ 20 days. The chicks are late-maturing, and the parents can only move independently about 1 month.

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