Handmade bird practice step by step to teach

Handmade bird practice step by step to teach the following:

1, first of all, the paper along the center line folded out of the cross, turn over and fold out of the word rice.

2, then the two corners along the center line folded in half, along the trace folded out a diamond, the other side repeat the same steps.

3, one corner folded to the top, folded, the two sides of the corner turned up, folded out of the bird's wings.

4. Press down on one side and fold inward to create the bird's slender beak.

The bird is also known as a bird. Definition: an oviparous vertebrate with feathers covering nearly the whole body, Dictionary explanation:a class of vertebrates, warm-blooded oviparous, breathing through lungs, feathered nearly all over the body, able to walk on the hind limbs, the forelimbs become wings, and most are able to fly.

In zoology, the main characteristics of birds are: streamlined body (fusiform or pike-shaped), most flying life. The body surface is covered with feathers, generally the forelimbs into wings (some species of wing degeneration); pectoral muscles developed; short rectum, food digestion fast, that is, the digestive system is developed, help to reduce the body letter pin jie heavy doudan, and conducive to flight; the heart has two atria and two ventricles, the number of heart beats fast.

Origin of Birds

In 1868, Huxley proposed the hypothesis that birds originated from dinosaurs. Huxley was a famous British slipper biologist and a strong supporter of Darwin's theory of evolution, and he was also one of the first scholars to propose the theory that birds originated from dinosaurs.