Answer :
A loose hypothesis birds evolved suggests that the ancestors of birds probably ran and jumped to catch prey, and evolved flight to improve on this and return safely to the ground.
Birds evolved from theropod dinosaurs in the Jurassic period (about 165-150 million years ago), and their classic small, light, feathered, and winged body shape was not a spurt of innovation, but rather Gradually assembled over tens of millions of years of evolution. Modern birds descended from a group of two-legged dinosaurs known as theropods, including the towering Tyrannosaurus Rex and the smaller Velociraptor. Some of the similarities between birds and humans are because they shared a common ancestor millions of years ago. This ancestor was a primitive reptilian creature that resembled neither humans nor birds, but shared features of both.
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