The genus Corvus Linnaeus (1758) is a bird of the ornithischia family, the family Crow, with a total of 41 species. Some of its species are the largest of the passeriformes, and are generally medium-sized; They have strong legs and toes; Hard and thick mouth; The nostrils are located about 1/3 of the forehead, completely covered by many very hard and straight nasal whiskers, and reach the middle of the mouth; The tail is generally medium-long, but there are also short or slightly longer tails that are convex; The body color of the crow genus is black, black and white, black and gray, and often has beautiful purple and blue, green, or silver flashes.
Distributed several times around the world. There are 7 species in China, most of which are resident birds, and are more common in bald-nosed crows, Dauri crows, and large-billed crows. Bald-nosed crows nest in groups of tall trees in the vast plains from eastern to northeastern China, with a black body and featherless back at the base of the mouth, revealing gray-white skin. The white-necked crow nests on tall trees from the plains south of North China to the low mountains, rarely flocks, and has black body feathers and distinct white collars.
Jackdaw is a small crow common in the vast mountainous areas and nearby mountains of northern China, with a white chest and abdomen and a white collar, and the rest is black; It likes to nest in the crevices of cliff holes, tree holes, and tall buildings. The large-billed crow breeds in the vast mountainous areas south of northeast China, with a large body, a thick mouth, and a black body. The raven is the largest of the crows , with a body length of about 600 mm , a black body , most of the body feathers , as well as wings and tail feathers with blue-purple or blue-green metallic flashes , and a very stout beak.
Nest in the plateau and mountain crevices of the Tibet Autonomous Region at an altitude of more than 3,000 meters. Bald-nosed crows, jackdaws, and large-billed crows are the main mixed wintering birds in eastern and northern China.