Agro-Bots

Agro-Bots are huge, heavily-armoured machines once invented by the Martians of Mars to tend to the crop fields. Since they are automated, they still mindlessly go through their by now totally useless task. It usually ignores humans. But should it detect one in its way or on the fields, it will try to exterminate the "pest" that has "infected" the plants. Needless to say that fleeing is better than facing these huge machines.

Usually found on the fields of Mars.