Owl is a general term for some nocturnal birds of prey in the order Ostrich. Many owls have upright feather clusters above their ears, such as ears or horns, so their faces look like cats, so they are usually called owls. There are 3 families, 24 genera 135 species of Oysters. These owls have their own names, such as chestnut owl, barn owl, eagle owl, carved owl, Japanese owl and so on. Therefore, we can't say what kind of bird the owl is, nor what its scientific name is. There are some kinds of owls, which are distributed all over the world, and some are only found on some islands. All owls have the same system and are easy to identify. Body length 13 to 70 cm, wing spread 30 to 200 cm. Most species are relatively small. The head is big, and it can rotate in any direction more than 180 degrees. Eyes are big, fixed in the orbit, unable to move, both eyes are forward. Almost all owls are active at night, and there are only rod-shaped cells in their retinas, so their vision is colorless. Owl's vision is binocular vision, which enhances depth perception by moving its head away from the central plane. Contrary to popular belief, owls are not blind during the day, their pupils can be extremely narrowed, and their eyesight is better than that of people at night. A feather collar with feathers around the ears, whose function is to concentrate sound. There is a movable earmuff at the front edge of the ear hole, which can act as a reflector and concentrate the sound. Many owls have asymmetric openings on both sides of their ear holes, and their ears are sensitive to different frequencies. Therefore, the sound source can be located in two planes at the same time. Species in the north have thick down to keep warm. Most species' flight feathers are covered with a layer of fluff, so they are silent when flying. Feathers vary in color, a few species are single in color, and most species have light stripes and speckled markings, which have protective color function against the background of bark. Owls can be found in almost all living environments, from grasslands and tundra to dense woodlands and rainforests. The population density of many species mainly depends on the available nesting area, not the amount of food that can be hunted. Owls are carnivores, and the most common prey is rodents, such as mice. Little owls eat insects and fish owls eat fish. The prey is swallowed whole, and the undigested parts (such as feathers, fur and bones) are spit out lump by lump. Owls are mostly nocturnal, but they are mostly inactive in the middle of the night. They usually sing and hunt before dawn. Voice communication is often used, especially in the field of mating and defense. During the day, their feathers cling to their bodies, their ears stand up and their eyes are half closed. Owls nest in tree holes, cliffs and caves. On the grassland, it nests on the ground. Each nest can produce at most 12 eggs, and the eggs are nearly spherical. Owl has a great effect on preventing rat damage, which is a kind of. Owls were not all evil incarnations in ancient times. In ancient Greek mythology, there was a goddess of wisdom named Athena. It is said that her favorite bird is an owl. So the ancient Greeks worshipped the owl very much and thought it was a symbol of wisdom.
There are 133 kinds of owls in the world, and the barn owl mentioned above is just one of them. In the south of China, there is an owl that is very similar to a barn owl, that is, a grasshopper. The grasshopper's face looks like a monkey, so many people call it a monkey-faced eagle. Grasshoppers often haunt cemeteries. Their flight is erratic and their cries are shrill, which often reminds people of wild ghosts wandering in cemeteries. In fact, grasshoppers haunt cemeteries because there are a large number of wild rats for them to prey on. Owls, also known as owls, are commonly known as owls, because their eyes are round and big, much like cats' eyes. Owls belong to the nocturnal raptors of Ostrich, with more than 180 species. There are about 26 species of owls distributed in China, all of which belong to the national second-class protected animals. The unique feather design makes the nocturnal owl the quietest flying bird in the world, and sometimes even keeps silent to its prey. Its eyes are not born on both sides of the head like other birds, but in front. The owl's big eyes can only look forward. When it wants to look both ways, it must turn its head. The owl's neck is long and soft, and it can turn 270 degrees. Because it is a kind of prey that comes out at night, their hearing is very keen, and their ears are not on a horizontal line, which is conducive to determining the correct position of prey according to the sound made by ground prey. Estrus is day and night, seasons and occasions.