Maybe they should just simply adjust the creature starting zones THEN focus on other stuff...
This is the exact reason my tribe moved a couple squares inland. They shouldnt be adjusting code simply because of the players desire to crowd certain areas. Get me? A tribe choosing to move into a more populated area should expect to see less creatures and wildlife...but see much more people.
It would be understandable to expect more creatures to be found along the rivers and forests rather than lakeside.