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If you've established your world as one with fantasy species, it's okay if you don't mention every one early on. Lots of novels and screenplays throw new species into the mix later on and that's f...
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Source: https://writers.stackexchange.com/a/46393 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/46393 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
If you've established your world as one with fantasy species, it's okay if you don't mention every one early on. Lots of novels and screenplays throw new species into the mix later on and that's fine, so long as you've established that your world is one where similar species already exist. Novels such as _A Discovery of Witches_ establish a couple species not long into the story but add others later, sometimes in other books in the trilogy. Well known species too. TV shows like _Buffy the Vampire Slayer_ and _Being Human_ do the same. If you want to briefly mention or hint at it, that works too. But it's not necessary.