'''Archaeopteryx''' is a theoretical [[bird]] based on a few [[fossil]] fragments. This theoretical bird is sometimes presented as evidence of evolution because the bones have some characteristics reminiscent of [[reptile]]s, making it appear to be a so-called "transitional" form between reptiles and birds. | '''Archaeopteryx''' is a theoretical [[bird]] based on a few [[fossil]] fragments. This theoretical bird is sometimes presented as evidence of evolution because the bones have some characteristics reminiscent of [[reptile]]s, making it appear to be a so-called "transitional" form between reptiles and birds. |