What is the jingle content of playing with birds to ruin your life?

Fishing is poor for three years, but playing with birds destroys life. Once you learn to drive rabbits out with dogs, you can never come back. If you love an eagle, you will look up at the sky with tears in your eyes.

Birds, also known as birds. Definition: Egg-laying vertebrates covered with feathers. The main characteristics of birds are: streamlined bodies (spindle or spindle), most of which can fly. The body surface is covered with feathers, and the forelimbs generally become wings (some kinds of wings degenerate); The pectoral muscles are developed; Short rectum, large appetite and fast digestion, that is, the digestive system is developed, which helps to lose weight; The heart has two atria and two ventricles, and its heartbeat is fast.

The body temperature is constant. In addition to the lungs, the respiratory organs also have multiple airbags to assist breathing, so that birds have oxygen passing through the lungs when inhaling and exhaling, that is, double breathing.

Bird skin

The skin of birds is characterized by loose and thin skin and underdeveloped glands. Sebaceous glands are tail sebaceous glands, and the oil secreted by them is smeared on feathers through their beaks, making them moist and not wet by water. The secretion of caudate finger gland also contains ergosterol, which can be converted into vitamin D under ultraviolet irradiation. When birds rub their feathers with their beaks, vitamin D can be absorbed by the skin, which is beneficial to the growth of bones.