This one gives me the creeps. Probably a marionette or puppet but who can say for certain.
here is the description from the youtube page
This is allegedly alien interview/interrogation footage from Area 51 in the late 1980s early 1990s that was smuggled out. The alien grey/gray is talking (telepathically) to the human interviewer outside of frame. During the footage, the alien appears to get a worsening sickness, which one of the symptoms is coughing. The alien launches into a coughing fit and paramedics hurry into the room. The footage ends after the paramedics rush into the room. Meanwhile, I am not sure what it is, but there is a blue/green/yellow light that bounces ontop of a table near the alien. The UFO repeatedly bounces through the footage.
Not sure what to make of this video ...... fairly sure it's fake. Why is the room so dark? Seems to indicate the makers don't want things to be seen clearly! The 'alien' looks like a monkey to me ..... a marmoset? something like that.