(March 9, 2016 at 8:47 pm)Aractus Wrote: It looks like a bird but it isn't, and it never became one through evolution either. It's a dinosaur, and it's name is Archaeopteryx. It lived 15 million years ago. Some people claim that it was transitional which is wrong because it didn't transition into a modern bird, it died out (though technically all theropoda dinosaurs were in a period of change from whatever they evolved from millions of years ago, but simply labelling it as being "transitional" is a gross oversimplification unless you recognising that ALL life is transitional which makes the term meaningless anyway). Birds evolved from other theropoda dinosaurs, and they evolved separately along different paths from different dinosaurs. Thus we have birds today that evolved from different dinosaurs, just as humans and other apes evolved from different "dinosaur" ancestors, but it just happens that we share a common ancestor with apes sometime 7-14 million years ago. Birds would share common ancestors as well, of course, but not in the late Jurassic period. It's an example of convergent evolution - i.e. birds that are only distantly related to each other evolved similar features to each other (such as flight) independently of each other.
1. You left off a zero. Archaeopteryx lived about 150 million years ago not 15 million.
2. Humans don't have a dinosaur ancestor. Dinosaurs and humans share a reptile ancestor. Reptiles split into two branches about 260 million years ago. One was Sauropsids which evolved into dinosaurs, birds and modern reptiles. The other branch is Synapsida which evolved into modern mammals.
Save a life. Adopt a greyhound.