You got it BugMeNot. You need live specimens to complete the game.
I don't remember about the "robotics" Aliens, but I do know that sometimes an heavy hit can stun ennemies. If you are lucky you could hit an ennemy and not kill him but manage to stun him. If he's one of the last Aliens downed in the mission then he won't have time to wake up and he'll show up as a live specimen in your mission debriefing.
Don't worry about it tough, you don't need all the tech to finish the mission. And most of the autopsy and live Aliens study add more flavour to the game than anything else. Only a few actually get the game forward and are critical.
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