As previously mentioned in Part 1 of the “Alien” franchise stories series, the chestburster is the second stage of the Xenomorph. Its body structure is one that resembles a snake of sorts with arms.
After the chestburster removes itself from the host it most commonly slithers away as fast as possible to ensure its safety and survival. It isn’t certain what the chestburster does as it hides and grows. But what is known is that it doesn’t take long; in a matter of hours the chestburster matures into an adult Xenomorph.
The Xenomorph is proven to have an inner mouth structure in its mouth instead of a tongue. The Xenomorph is completely black and has a cluster of tubes on its back, assumed by most to be a way of breathing for the creature but this isn’t proven.
It appears to have no eyes, nose or ears, but if seen close enough, there is a visual for a human skull in the Xenomorph’s face if the host was human. The skull has eye and nose holes but it is not understood why since they have no nose or eyes.
The Xenomorph has a mostly human structure if the host was human, with all four limbs but it is obviously not human with the skin-like composure. The Xenomorph has an elongated head with the majority of the head in the back.
The creature still has acid blood making it hard to combat safely. The Xenomorph also has a tail with a sharp tip good for stabbing in an attack or defensive state. It uses its secondary mouth to puncture holes the skulls of its victims, and can blend into dark spaces and hiding spots due to its dark exoskeleton color.
The Xenomorph also has silver, shiny teeth made of an unknown material and tends to drool a lot. This proves very frightening when you feel the cold wet slobber fall on you as you stand under an air vent as you know the Xenomorph is going to attack you at any moment.
This is also proven in the game “Alien: Isolation.”
