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I've been coming up with alien races to populate an entire galaxy as part of a cyberpunk/sci-fi setting I've been writing for the last 6 years.
The longest I’ve ever worked on a project is two years… Props to you! I have a really bad habit of not finishing anything because I have a lot of ideas that are always “more interesting” than my last.
Do you do much speculative biology for your aliens? I’ve been getting into that a lot recently.
The only thing I utilize is the rule of cool. If it sounds cool, their biology will have it. 😎
I'd say that's the best way to do it. I like to have evolutionary reasons for the biologies my species have, but the plausibility of those reasons are the least of my concerns, lol.