Why are there still so many birds in the world

Birds are taxonomically a class under the subphylum Vertebrates. Birds are bipedal, homeothermic, oviparous vertebrates covered in feathers, with forelimbs that evolved into wings and a hard beak. Birds range in size from very small hummingbirds to giant ostriches and emus (a large, flightless bird native to Australia).

There are more than 9,000 species of birds known to the world, and more than 1,300 species have been recorded in China alone, including many endemic species to China. With about 120-130 species of birds extinct, birds are a species with many unique physiological characteristics compared to other terrestrial vertebrates.

Archaeopteryx is the most famous primitive bird found in the Mesozoic Jurassic period, with body characteristics common to both birds and reptiles, such as teeth and fingerclaws on wings. Some scholars have proposed that dinosaurs are the ancestors of birds; The newly discovered Chinese dragon bird and Confucius bird in northeastern China are thought to be the link connecting dinosaurs and birds, more like feathered dinosaurs, older than Archaeopteryx.

It is generally speculated that the Miocene of the Tertiary was the heyday of birds, and then the ice age came, and the birds were hit hard, and the population declined, and less than 10,000 species and more than 20 orders have survived to this day.

The crested ibis, the rarest bird in the world.

The crested ibis is the rarest bird in the world and is known as the "Jewel of the Orient" because of its preciousness. This species was once widely distributed in East Asia, such as Russia, Korea, Japan, and China. Since the 30s of this century, certain human economic activities have changed the ecological environment of the crested ibis' habitat, making it difficult for the crested ibis to adapt to such changes, resulting in a sharp decline in population and range.

At the end of the 70s, it became extinct in Russia and North Korea, and only one remains in Japan.

Since 1981, when China rediscovered the world's only seven wild crested ibises in Yangxian County, Shaanxi Province, China has done a lot of conservation work, and has successively established the Shaanxi Crested Ibis Conservation Observatory and the Shaanxi Crested Ibis Rescue and Breeding Center. Through unremitting efforts, the total number of crested ibises has increased to more than 120, including nearly 60 wild populations, and two artificial populations have been established, one is the artificial population of Shaanxi Crested Ibis Rescue and Breeding Center, with a number of 54 individuals; The other is at the Beijing Zoo with a population of 17 individuals.

In the 30s of the 20th century, German ornithologists discovered the crested ibis in Japan and named it Nipponia NipponThe crested ibis is a large and medium-sized wading bird, weighing about 1500 2000 grams, with a long and curved beak and vermilion at the tip of the beak, legs and toes. The plumage is leaden gray in spring and summer, and turns pinkish white in autumn and winter.

The crested ibis usually flocks and roams in rivers, ponds and farmland, feeding on insects and aquatic animals such as loaches, frogs, crabs, small fish, and shrimp. The crested ibis is paired as "monogamous", March to June is the breeding period, the nest is on the fork of tall trees such as pine and oak, laying 2 4 eggs, male and female birds take turns to hatch and brood, the incubation period is only 27 days, and the brooding period is about 40 days. Snakes, birds, eagles and mustels are natural enemies of the crested ibis, and they often destroy their nests and even eat their eggs and chicks.

In addition, the destruction of forests, the reduction of wetlands, pesticides and fertilizers caused by human production activities pose a fatal threat to the survival of the crested ibis.

According to early historical records, the crested ibis is a migratory bird, and with the long-term evolution, the crested ibis has become a resident bird in Yangxian County. The activity area of the crested ibis can be divided into breeding area and wandering area, the breeding area is generally in the deep mountain area, there are few villages and farmers, the forest coverage rate is large, and there is a considerable water area suitable for the crested ibis to feed. The wandering area is in the shallow hills and along the Han River.

In order to raise the public's awareness of wildlife protection, the Shaanxi Provincial Forestry Department and the Shaanxi Crested Ibis Conservation Observatory have printed a large number of pamphlets and almanacs about the crested ibis and distributed them to the public. In the nesting area, observation posts are set up to monitor day and night, defensive measures are taken to prevent the harm of natural enemies such as snakes, timely rescue of sick and injured weak chicks, and the population dynamics of the crested ibis are studied by means of ringing and radio telemetry devices. In recent years, with the growth of the crested ibis, the scope of activities involves most of Yangxian County and the relevant areas of Chenggu, Xixiang, Hanzhong, Mianxian and Foping counties, covering an area of nearly 3,000 square kilometers.

In the meantime, many places are densely populated. How to protect the crested ibis in such a large area so that this species can survive in nature for a long time will be a long-term and arduous task for us.

By the 80s of the 20th century, only in Yangxian County, Hanzhong City, Shaanxi Province, China, the only 7 wild crested ibis populations were found at the southern foot of the Qinling Mountains, so the world's smallest rare bird is the crested ibis

The fewest bird in the world is the Austronesian lop jay, with a remaining number of 1

What a difficult question....Personally, I think that those endangered species are ...... that are about to become extinct

What is the most populous bird in the world? There are many species of birds, and there are many species with large families.

1. The number of natural miles in the world.

The most answered, the most amazing is - the red-billed "Jili Bird". The red-billed "Jili bird" lives in the dry early area of the southern part of the Desert in Africa, and has the most impressive breeding number, with a total of 10 billion birds, which can be said to be the largest number of birds. This is closely related to its own strong reproductive ability and tenacious adaptability to survive.

2. The largest number of captive-bred birds in the world is chickens. Chickens are the most commonly kept poultry by humans. Domestic chickens originated from wild raw chickens, and the original domestication as poultry was to provide people with a variety of special eggs, meat and other foods, and to provide people with cheap and high-quality animal protein.

According to broiler production data provided by the United States Department of Agriculture, global broiler production in 2016 was 89 million tons. Experts estimate that 60 billion are slaughtered in the world every year, and about 150 billion are stocked annually.

The largest number of wild birds are the African sparrow.

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 feathers (and thus no pinnae formation), well-developed mating organs in males, and reduced toes adapted to running life (2 3 toes).

It 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.

The first factor is the view of evolution: all kinds of animals and plants in the world are in a process of constant change and development, and their own genes and other biological factors determine the nature of their development, constantly evolving in all directions, and after thousands of years, they gradually evolved into today's various birds.

The second factor is the result of natural or artificial selection, i.e., the influence of external conditions. The world is so big that the preferences of individual geographical environments or people have a great influence on the evolution of birds. There are many species of birds that are the same, but there are differences in body shape, internal mechanism, etc.