Don't mind me-
I LOVE creating new species/ rules/ anatomy whatever (basically lore building). So, how I do it is kinda just basing it off of real life! To create a species, I usually have a few things I look at first before I just create them willy nilly.
- What enviroment do they live in? (Is it cold? Hot? Humid? Flat terrian?)
- What do they eat? (Are they herbaviors? Carnivors? Omnivors?)
- Are they domesticated? (Do people/other creatures fear them? Are they agressive?)
These are really just the starter questions I use. Once I have those answered, then I started designing.
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Example:
- This creature lives in a cold enviroment --> This creature is white to blend in with snow, and has dense fur to stay warm. I may had blue and brown accents.
- This creature is an Omnivor, but hunts regularly. --> This creature has sharper teeth, and it's eyes are in the front of it's head. It might have horns for ramming, and it has sharp serrated claws for climbing and latching onto prey.
- This creature is not overly aggressive --> This creature does not have overly shiny designs as it does not need to warn others (brightly colored animals usually mean venomous/ 'don't mess with me'. It is smaller, not needing to overpower others. It uses it's speed.
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Uh, I don't know if this helped, I might edit this because I love world building but I hoped this helped!
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Also another tip I like to use is adding tiny traits and quirks (like fire dragons hibernate in the cold, and are typically territorial, etc)
Summer Month: 3 
Night 
Earthquake Moon: 
