What contribution does crow make to mankind?

Many kinds of crows like to eat carrion, which is good for seedlings and grains. During the breeding period, small vertebrates, locusts, crickets, scarabs and moth larvae are mainly fed, which is beneficial to farmers. In addition, because they like to rot and peck at agricultural waste, they can eliminate the pollution of animal carcasses and purify the environment.

Crows inhabit low mountains, broad-leaved forests in plains and mountains, mixed coniferous forests, coniferous forests, secondary mixed forests, artificial forests and other forest types. , especially in sparse forests and forest edge areas. I like to move along forest roadsides, cliffs, river valleys, coasts, farmland, swamps and grasslands, and sometimes even appear on hilltop shrubs and alpine tundra.

But in winter, it often goes down to the low hills and plains at the foot of the mountain, often moves near human settlements such as farmland and villages, and sometimes goes in and out of town parks and urban trees.

Extended data

Classification:

1, white-tailed ground crow?

At present, the number of white-tailed ground crows is less than 7,000, which is an internationally renowned endangered species. However, so far, the white-tailed ground crow has not been listed in the national and regional wildlife protection list of China. Mr. A?vagho?a, the tutor, has repeatedly called for the establishment of a white-tailed ground crow reserve, which is the first time to bring the white-tailed ground crow into the environmental protection field of Chinese people.

2. Starcrow

Nucifragacaryocatactes is 800px long and its feathers are mostly brown with white spots. When flying, white tail feathers and Bai Duan tail feathers stand out. A gentle, undulating, rhythmic flight. Pipe-like sounds with whistles and clicks, and the bleating of young birds with nasal sounds.

3. Black-tailed ground crow

Black-tailed ground crow is a slightly smaller (750px) light brown ground crow with sandy brown upper body, slightly burgundy back and waist, black head with blue luster, shiny black wings, white patches on primary flight feathers and blue-black tail. Black-tailed ground crow is an endemic species in Central Asia. It is a resident bird and lives in desert areas. Mainly distributed in western China, only a few in neighboring Mongolia and Kazakhstan.

Domestic distribution areas are mainly in western provinces such as Xinjiang, Inner Mongolia, Qinghai, Gansu and Ningxia. According to the field investigation by A?vagho?a et al. (2006), black-tailed ground crows are distributed in nearly 40% of counties and districts in Xinjiang, with a density of 5-8/100 km2 and a population of about 50,000.

4. Mountain Jay

Western jackdaw is a small and beautiful black crow. There are two kinds of mountain crows in Urumqi, the red-billed mountain crows and the yellow-billed mountain crows. Western jackdaw has a red mouth, a bright red beak bent down, and red feet. Unlike Western jackdaw with a yellow mouth, its mouth is short and red, not yellow.

Flying is very agile, hitting the hot air, gliding with short and wide wings and obvious primary flight feathers open. Red-billed Jay lives from a small group to a large group. A shiny black Jay with a small body (38 cm). The yellow mouth is thin and curved, like Western jackdaw with a red mouth, but shorter than the red one. Habits such as red-billed Jay, but generally live in higher altitudes. Social habitat. Clusters soar with the hot air.

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