Before any of you asks, this has NO relation to the Anatomically Correct series. That is someone else's series and put more emphasis on evolutionary plausibility than I am interested in.
If evolutionary plausibility were the goal for this series, we'd be here forever trying to find some justifications for the really extreme mythical creatures.
No, the real goal is to make it biologically feasible without resorting to the cliches and stereotypes that have been pounding them for centuries.