It is important to recognize that classification is a tool invented by human beings, not imposed by nature. We found a way classifcation useful to describe related, but does not clearly define the boundaries of the nature of concern and help us. It just becomes more complicated as we find more fossils to fill the gaps in the records. So, archaeoptyrex a bird-like dinosaur or dinosaur-like bird? It certainly has some features we do not usually associate with modern birds. But it is certainly more like birds than we tend to think, as a dinosaur.
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