It may seem like graboids pursue only humans in the movies, but in fact we tried to imply that they do hunt other prey. Miguel’s cattle. Old Fred’s sheep. The coyote in Tremors 2. As to the second point, graboids would avoid cities just due to the sheer noise level. It would be impossible for them to isolate and attack anything when there’s a steady cacophony of cars, trucks, cycles, pedestrians, etc. coming from all directions.
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