Bird fossils refer to the remains or traces of birds that lived a very long time ago, which have been preserved in the earth's crust. These fossils provide valuable information about the history and evolution of birds. Full definition
A new analysis of early bird fossils adds weight to the idea that they once had four wings. (newscientist.com)
«Keratin and melanosomes preserved in 130 - million - year - old bird fossil.» (sciencedaily.com)
Well, the reason you won't find half fish - half bird fossils is because they diverged evolutionarily long before either reached a form that you might recognize. (religion.blogs.cnn.com)