Why are crows black, are all crows black

This is the evolution of bird crows over thousands of years, and no one has studied why they evolved into black.

1. First of all: it is not because of the word "crow" that there is such a bird. It is with such a blackbird that it has the name "Crow". So the crow is black.

2. Secondly: crows are the common name for several species of black birds in the passerine family. There are 36 species in total, and they are distributed almost all over the world. There are 7 species in China, most of which are resident birds. That is, crows are just a general term for those birds.

For example, the crow's feathers will appear black, because it is an animal that often eats spoiled food, it can vigorously absorb the heat of the sun through its black feathers and increase its own resistance to body surface temperature search, and then kill the germs and parasites contaminated on the body surface, many scavengers have the characteristics of dark fur.

In addition to this, the crow's penchant for nocturnal action is also the reason for its black plumage. Because black allows the crow to hide itself better in the dark night, so that it does not appear by the animals it is hunting or its natural predators, so that it can survive in the nature of survival of the fittest.

The crow's feathers will appear black, because it is an animal that often eats spoilage food, it can use its black feathers to vigorously absorb the heat of the sun's rays and increase its body surface temperature, and then kill the germs and parasites contaminated on the body surface, many scavengers have the characteristics of dark fur.

In addition, the crow's penchant for nocturnal action is also the reason for its black feathers, because black color allows the crow to hide itself better in the dark night, not to be discovered by the hunting animals or its natural enemies, so that it can survive in the survival of the fittest in nature.

The meaning of the crow fight

In the folk, people's attitude towards crows is more negative than positive, and the reasons for this are as follows: first, black means darkness; second, the crow's cry is miserable; The third is that crows eat carrion, even human corpses; Fourth, crows often appear in desolate places such as graves.

A large flock of crows often gathers in the mounds and carrion and cries loudly, and this scene and call are reminiscent of death, so they cause a sense of fear and trembling, so crows are often considered a bad omen.

In a large number of ancient poems, all express the disgust of the crow's habits or the sense of depression brought by the crow, the crow often and the countryside, the lonely temple, the battlefield and other imagery constitute a desolate and decadent realm, such as Han Yuefu "Zhan Cheng Nan" said: "Zhan Cheng Nan, die Guo Bei, wild death is not buried Wu is edible." "Collapse and grinding" refers to the viciousness of crows eating carrion.

The black color of the crow is due to the pigment molecules of the feathers, mainly tyrosine and melanin. Melanin absorbs most of the light and therefore appears black. This color allows crows to dig at night to better hide themselves and better absorb the sun's heat during the day.

In addition to this, black is also a symbol of the crow's wit, mystery, and beauty.

The statement that all crows are black is false. There are 36 species of crows, distributed all over the world, most of them are black, but there are three types of crows in Tanzania in Africa that are not all black, one is called the mottled crow, the other is called the white-necked big doy, and there is also a kind called the cloak white-billed crow, all of which are white.

The habitat of the crowsIt inhabits various forest types such as low mountains, plains and mountain broad-leaved forests, mixed coniferous and broad-leaved forests, coniferous forests, secondary mixed forests, and plantation forests, especially in sparse forests and forest edge areas.

He prefers to be found along forest roads, cliffs, river valleys, coasts, farmlands, marshes and meadows, and sometimes even in mountaintop scrublands and alpine tundra areas. However, in winter, it mostly goes down to low hills and plains at the foot of the mountains, and is often found near farmland, villages, and other places where people live, and sometimes in town parks and urban trees.