Origin of Birds-Evolution
All lives are a part of nature and it rules on everything on their own way. Evolution is a part of a way of nature. Generally it occurs at a very low scale and too slow to be witnessed by humans. Now day’s bird species are going extinct at a greater rate. There have many researches on Origin of Birds-Evolution. It is thought about the origin of bird’s revolution that the birds evolved from small carnivorous dinosaurs of the Jurassic period. The birds and dinosaurs shared some features and it has proved by the basis of evidence of fossils. The features were like hollow, gastroliths in the digestive system , nest-building and brooding behaviors. At the time of breeding female birds grow a special type of bone in their limb. The birds derived from a clade of theropod dinosaurs. The first known bird is Archaeopteryx. It had feathers along its arms and tails. It also had teeth and bony tail. It is definite that the features and character of birds evolved through a complex series of steps and served different functions along the way. Birds after Archaeopteryx continue the evolution. There were many bones were reduced and fused. It helps them to increase the efficiency of flight. The feathers became longer and the bone walls became thinner. The bony tail was reduced to a stamp. The bones of the shoulder got griddle to connect breastbone due to evolution. The breastbone became larger. It evolved a central keel in the middle of the breast that served to anchor flight muscle.