Species of birds

Archaeognathus, also known as flatchested suborder, is a suborder of ornithopoda. This general title can also be divided into the following seven titles: ostrich? ,? American ostrich order? ,? Crane ostrich? ,? Birds without wings? , ? Orders, ornithoptera, ornithopoda.

2. Wedgwynsuborder

Wedgewing suborder belongs to ornithoptera and ornithoptera. It only includes Sphenisciformes (Penguinidae), including 6 genera 18 species of penguins.

Step 3: Side head

Cephalopod, also known as the present jaw suborder, is the largest suborder of birds, including most existing birds. Its * * * characteristics are: developed wings, good at flying, and keel protrusions on the sternum. Finally, 4 ~ 6 coccygeal vertebrae are combined into a coccyx.

Extended data

There are many kinds of birds, second only to fish among vertebrates. 2 1 century, there are more than 9,000 species of birds known all over the world, and there are more than 1300 species recorded in China alone, among which there are many species endemic to China.

About 120 ~ 130 species of birds have become extinct. Compared with other terrestrial vertebrates, birds have many unique physiological characteristics. These birds are quite different in size, shape, color and living habits. Among so many birds, the largest is the ostrich, which is the "giant" among birds.

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