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Q&A Biology behind a monster that is able to remain invisible

This is a post-apocalyptic setting I'm working on. The world has been overrun by invisible monsters from another parallel universe. They can be heard and smelled, and they can form claw prints on t...

3 answers  ·  posted 4y ago by Space_Cadet‭  ·  last activity 4y ago by Space_Cadet‭

Question biology reality-check creature-design xenobiology