[Poggio]

I think the selection of species is fine for the moment. Trisphee is still a developing site and this is the first time that I've seen any real instance of a larger story. I understand what you mean and I am sure that sooner or later the site will come up with its own bestiary as well as an inept description of the fauna for each planet. ( That I must admit is something I am looking forward to, I love imaginary creatures though I think avatar the last air bender kinda coined a lot of them )

With world building it takes a vast amount of time and imagination. I'm sure people like j.K Rowling, Terry Prachett or RA Salvadore didn't just come up with their worlds over night. Though this site likes to have a lot of input from the users. ( its like a giant game of DND during the events some times XD ) so I think with time you will see cross breeds, talking beast, Giant blue cat beings... well maybe not giant blue cat beings xD.