There are several species of birds in the world, and what are the birds in the world

About 1,300 species of birds have been discovered in our country.

There are more than 9,000 species of birds in the world.

In the last 2,000 years, 139 species of birds have disappeared from the earth, a third of which have become extinct in the last 50 years.

Today's known birds are divided into two subclasses, the Archaea and the Ornithisania.

The Archaeopteryx subclass is represented by Archaeopteryx lithographica.

The present bird subclass includes some fossil birds from the Cretaceous period as well as extant birds.

Fossil birds are represented by the order Dusk and Ichthyomythidae, whose skeletons are similar to those of modern birds, but the upper and lower jaws have alveolar teeth.

The extant birds of the subclass Bird's Nest can be grouped into 3 general orders, namely:

1. Flat-chested heading.

It is the largest bird in existence (135 kg in weight and 2 5 m in height), and is suitable for running life. It has a series of primitive characteristics: vestigial vestiges, no keel protrusions in the sternum, no tail heald bone and tail fat glands, uniform distribution of feathers (no distinction between feathers and bare areas), no feather hooks on the branches (and therefore no pinnae formation), well-developed mating organs in males, and reduced toes adapted to running life (2 3 toes).

The distribution is confined to the southern hemisphere (Africa, the Americas and southern Australia).

The most famous representative of the Flat-chested General Order is the ostrich (Struthio camelus) or the African ostrich, while the other representatives include the American ostrich (Rhea americana) and the emu (or Australian ostrich) (Dromaus nova-chollandeae). In addition, in New Zealand there is a kiwi (apteryx oweni).

2. Penguins.

Medium and large birds of diving life have a series of characteristics adapted to diving life. The forelimbs are fin-shaped, suitable for paddling. It has scaly feathers (short, broad shafts with narrow pinnae) that are evenly distributed on the body surface.

The tail is short. The legs are short and move to the back of the torso, and the webbed toes are adapted to swimming. When walking on land, the body is nearly upright, swaying from side to side.

Subcutaneous fat is well developed, which is beneficial for maintaining body temperature in cold areas and in water. The bones are heavy and not inflated. The sternum has a well-developed keel protrusion, which is associated with forelimb strokes.

Swim fast, some call it "underwater flight". Distribution is limited to the southern hemisphere.

The general purpose of the penguin is represented by the king penguin (aptenodytes patagonicus).

3. Protrusion of the chest.

The poracic order includes the vast majority of extant birds and is distributed throughout the world, totaling about 35 orders and more than 8,500 species. Their common characteristics are: well-developed wings, good at flying, and the sternum with keel protrusions.

Finally, 4 6 coccygeal vertebrae healed into a coccygeal metaphysis. It has inflatable bones. The main feather is well developed, constituting a feather piece, and the body surface is divided into a feather area and a bare area.

The vast majority of males do not have mating organs.

Hope it helps.

There are two kinds, one male and one female.

<> there are more than 9,000 species of birds known to exist in the world, and our common birds are:

Ostriches, hummingbirds, penguins, swifts, vultures.

Big-eyed, egret, golden eagle.

Golden eagles, white-tailed sea eagles, kestrels, woodpeckers, cuckoos, nightjars, white-crowned pheasants, red-bellied golden pheasants, white-necked pheasants, larks, thrushes.

Embroidery eyes, red and blue spots, diving birds, grouse, wrens, peacebirds, pheasants, pepperbirds, caputails, orioles, bustards, hairy-legged sandgrouse, sand larks, sand peng, sand finch, snowcock, snow quail, plateau partridge, Tibetan finch, alpine, daisy, whirlpool finch, rock pipit, etc.

There are more than 9,000 species of birds known to exist in the world, and the common birds are: ostriches, celery hummingbirds, penguins, swifts, vultures, big-eyed, egrets, golden eagles, golden eagles, white-tailed sea eagles, kestrels, woodpeckers, cuckoos, nightjars, white-crowned pheasants, red-bellied golden pheasants, white-necked long-tailed pheasants, larks, thrushes, embroidered eyes, red and blue dotted foreheads, diving birds, grouse, wrens, pheasants, mountain pepper birds, capuched plum shouwu, yellow orioles, embroidery-eyed birds, great bustards, hairy-legged sandgrouse, sand larks, sand peng, which or Tibetan finch, Alpine, daisies, whirlwinds, pipits, etc.

In nature, birds are the most beautiful and pleasant of all vertebrates. From the poles of ice and snow to the roof of the world, from the rough seas to the dense jungles, from the barren deserts to the densely populated cities, there are almost all traces of birds.

There are more than 9,000 species of birds known to exist in the world, and the common birds are: ostriches, hummingbirds, penguins, swifts, vultures, big-eyed, egrets, golden eagles, golden eagles, white-tailed sea eagles, kestrels, woodpeckers, cuckoos, nightjars, white-crowned pheasants, red-bellied pheasants, white-necked pheasants, larks, thrushes, embroidered eyes, red and blue spotted foreheads, diving birds, grouse, wrens, pheasants, pheasants, pepperbirds, caputails, orioles, embroidery-eyed birds, great bustards, hairy-legged sandgrouse, etc. <

<> there are more than 9,000 species of birds known to exist in the world, and our common birds are:

Ostriches, hummingbirds, penguins, swifts, vultures, big-eyed, egrets, golden eagles, golden eagles, white-tailed sea eagles, kestrels, woodpeckers, cuckoos, nightjars, white-crowned pheasants, red-bellied golden pheasants, white-necked pheasants, larks, thrushes, embroidered eyes, red and blue dotted foreheads, spawning birds, grouse, wrens, wrens, pheasants, water pheasants, pepperbirds, caputails, orioles, embroidery-eyed birds, great bustards, hairy-legged sandgrouse, sand larks, sand peng, sand finch, snowcock, snow quail, plateau partridge, Tibetan finch, alpine, daisy, whirlpool, rock pipit, etc.

There are many types of birds, and the number of various bird species is very large. The class of birds is divided into two, one is passerine and non-passerine. There are so many species of passerine birds, nearly 5,500 species.

Among them, the non-passerine order is divided into six families, namely land birds, wading birds, migratory birds, climbing birds, songbirds and birds of prey. There are still many differences between birds, and the following will talk about some of the more common birds in our country.

Enumerated: 1: Sparrow.

Sparrows are birds of the genus Finches. This bird is the most common and at the same time the most widely distributed bird in China. There are 27 species of sparrows in the world, and there are 5 species in our country.

Sparrows are a bird that can be found almost everywhere in our country. These birds are generally monoecious, and their distinctive feature is a black throat, their chestnut head, and dark spots on their white cheeks. But they are relatively small in size and are relatively small birds.

2: Swallow. Swallow is the general term for 74 species of birds in the family Passerinees.

This bird is still relatively small in size and does not have too many feathers, this bird usually spends most of its time in the air catching pests, and they are usually more agile. The swallow is recognized as a beneficial bird by all of us. Their burrows are usually in tree hollows, or under the eaves of houses.

3: Raven. Crows are the common name for a variety of black birds in the genus Passerineidae.

They usually have a big mouth and like to tweet. It is the largest bird in the passerine order, with a body length of about 50 cm. The whole body or most of the feathers on the whole body are jet black, so it is called a crow.

The feathers are mostly black or black and white, with long beaks, and some have a bright white collar, and the feathers have a purple-blue metallic luster; The wings are much longer than the tails; Their mouths, legs, and feet are all pure black. The nostrils are about 1 3 long from the mouth, and the nose is hard and very straight, reaching the middle of the mouth.