A Headcrab from the game half-life, is an alien that latches onto people's heads and turns them into its slaves by stabbing its pincers into the host head directly into their brain, it usually spreads its limbs through the host's body to make them more alien like a hybrid between a headcrab and a human, can speak but occasionally makes screeching sounds, uses the host body to feed on other humans, it can't survive to long without a host so it will try to do that as soon as it thinks is possible