I see mutants wander about, but they never appear to be doing anything. What are all the rhinomen doing standing about?
Can't we see ottus grazing. Maybe a pack of wolfs attacking one and killing it.
Herds of brontos walking from waterhole to waterhole, making leets scurry to thier holes and the rhinomen standing in their way to scatter.
Maybe the omni snipers out in the fields, rather than standing there, could spend some time sitting and cleaning their rifles, eating, taking cover, maybe taking out the odd leet they see.
Also trucks of notum making their way from the mines to the clon**** cannons, maybe escorted by a small platoon of omni guards.
I am sure a full ecosystem is out of the question, but a lot could be done with a few new idel animations, and some long distance set pathing.