Chapter i origins and evolution of birds with basic knowledge
In the long journey of life on earth, birds have their origins as a strange and mysterious star that attracts the attention of countless scientists. Currently, it is widely recognized in the scientific community that birds originate in dinosaurs, or, to be precise, in animal feet. Evidence of this theory is mainly derived from fossil research。
In the late jurassic era, some 150 million years ago, the original bird was born, as a bridge linking dinosaurs to modern birds. The fossils of the original bird are also characteristic of dinosaurs and birds, and its bone structure, such as sharp teeth, long tails and finger claws, is very similar to dinosaurs; however, it also has feathers, which are a key feature of the distinction between birds and other animals. The feathers not only give the original bird a certain flight capability but also play an important role in body temperature regulation. The emergence of original birds marks an important beginning in the evolution of birds。
Over time, birds have evolved a unique set of adaptive changes in their evolution. Their physical structure has undergone profound changes to adapt to flight. The bones become mid-empty and thin, reducing weight and ensuring sufficient strength, while the chest muscles become extremely well developed and provide powerful power for flight. In addition, the respiratory system of birds has been optimized to develop efficient double-respiratory mechanisms capable of quickly obtaining sufficient oxygen during flight。
In the extended river of evolution, birds continue to adapt to various ecological environments and to divide into many different groups. Their shapes, habits and appearances have become very different, ranging from sky-dwelling birds, to small, small birds, from runaway birds, to birds adapted to aquatic life, where birds occupy an important place in the earth's ecosystem with their unique evolutionary path。
