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Q&A Is the evolution of my aliens realistic?

So, I have thought about the evolution of my aliens and how they could evolve things like lactation but still retain their reptilian characteristics. Here is my best thought about it so far: Evol...

4 answers  ·  posted 6y ago by Caters‭  ·  last activity 5y ago by Caters‭

Question biology evolution reptiles mammals xenobiology