They were near mining drills and belts (which they rided frequently).
Then they just mooved back and forth for about an minute before most of them ran back (out of radar active sensor range), probably building base.
What I would expect is that they would destroy the copper drills and belts and then build a base there.
Second thing: Can you do something with biter riding belts? It's wierd, shouldn't they eat them instead? or step of off them?
The running back and forth: They all run towards where the green lines intercepts, then after short while run alongside yelow path. That repeats.
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