I take great pride in my creatures, I try to develop them as best as I can and will continue to do so.  Creating biology and evolution is one of my favorite parts, speciation has always interested me and I love when other films and franchises expand on their creatures and give back story, environment, etc to them.

So please, take your time reading about them.  I've put in hard work on thinking how they would work in the wild, how they would interact with other organism, their reproductions and many other things.  Much more than is even necessary.