http://www.pbfcomics.com/archive_b/PBF084-No_Survivors.gif
What happens when you go back three days later and they've respawned :ahhh: .
If they come back after being beheaded, they must be some kind of chupacabre. At which point you have to kill them again, and hack off their arms and legs.
If they come back from that, I don't know what they are. No-bark probably does, though; he's a scientist.
(My game is modded for 24 hour respawning, btw. Keeps things lively :lmao: )