The bird is a friend of mankind, it is beautiful, lively, intelligent, and can fly. Whether under the trees in the autumn breeze or on the side of the road in the wilderness in winter, magpies fly over to them, happy and vibrant, exhilarating and festive. Ancient poets also used many poems to express their love for birds: the moonrise frightens the mountain birds, and when the spring stream is whine. Thousands of mountain birds flew away, and thousands of people disappeared. Feel the flowers splash tears, hate other birds amazing. Birds can fly into the blue sky and swoop down from the clouds, free. But if the bird can't fly, can it still be called a bird? However, there are many strange worlds, and there are indeed flightless birds in nature, penguins that can only walk on the ice field of Antarctica, ostriches that can only run in the African desert, and wingless birds living in New Zealand. They can't fly, flying birds can fly and escape when they encounter danger, and non-flying birds can only run desperately, very hard and dangerous. There is also a reason why these birds have lost their ability to fly, because their ancestors, living in a superior living environment with no natural enemies, no greedy predators, and plenty of food, make them live a comfortable life every day, their wings have not flown, they have not been used, the wings have slowly degenerated, become smaller, lost their flying muscles, and lost the consciousness of wanting to fly, so they really can't fly.