Looks like Krang (from turtles) but only this time with a hoover platform instead of those nice robotics legs and equipped with a powerful gun which is quite accurate plus the nice self destruction system that goes off if you shoot this to the ground. That's why you should always use if in close contact some hand to hand weapons and so on . But if you shoot these (like i usually do) it is nice if there are some other aliens close to this because they will get a bang of it also and i usually encounter these Bio drones in un suspected places like behind some doors or corners very close and too hard to be shot from there but you usually get some idea how to go pass the problem and kill it like run away

See also Bio-dorne autopsy click  hear
 

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