Facehugger

The Facehugger's body is mottled brown and gray, allowing it to blend in with its surroundings. It has a segmented appearance, much like a centipede or earthworm, with each segment bearing a pair of thin, nearly translucent appendages that it uses to crawl and sense its environment. The creature is almost amoeba-like in its ability to shape-shift, allowing it to adapt to its host's face or wriggle into tight spaces as it searches for a suitable individual to attach itself to. The Facehugger's goal is to attach itself to the victim's face and orally transmit a Xenomorph embryo down the victim's throat. The victim remains in a comatose state during the process, which can take several hours - once the process is complete, the Facehugger will detach and die.