What do many scientists believe in the common origin of all birds?

Many scientists believe that all birds share a common origin, tracing back to theropod dinosaurs, which are a group of bipedal dinosaurs. This connection is supported by extensive fossil evidence and genetic studies that show similarities in bone structure, feathers, and other traits. The evolutionary transition from dinosaurs to birds is marked by significant adaptations, including the development of flight. This common ancestry underscores the idea that modern birds are essentially living descendants of a diverse lineage of prehistoric reptiles.