In the movie Aliens, Hudson and Vasquez were approaching a motion blip on their trackers, they hadn't any clue what awaited them. At once going through the door into the room, the see these cute little creatures and they think it's a "negative situation". BUT IT'S NOT. Those apparent hamsters somehow survived the xenomorph attack. They are not hamsters, but the more evil version of the mice from Hitchhikers!
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"In the kingdom of hope, there is no winter."