From Xenopedia
The Chestburster (aka burster) is a Xenomorph larvae or Baby Alien. Its egg is laid in the host's bronchial tubes by a
Facehugger, where it hatches. It then burrows for the host's aorta (major artery in the heart), where it feeds on absorbed nutrients and white blood cells. After about an hour or two, it lets go, and begins swimming about in the host's body, causing mild discomfort at times. It can take from 1-24 hours after it lets go, for it to become large enough to leave the hosts body. It then finds the sternum, and starts chewing. This causes the victim great pain, shock, and blood loss. Then, true to its namesake, it pops out, and finds a nursery, chicken coop, or, less messy, a food locker, something with a large amount of helpless meat. Its carapace has yet to harden, and it has a dull grey fleshy hide. Depending on the host, it will grow to become a Drone (human, black carapace ,standard
Xenomorph), (
PredAlien,
Yautja, yellowish-green partial hide), or (
Runner, any given quadruped, red hide). Genetic alteration causes it to split into identical twins after escape from a human or quadruped (AVP Extinction).
An embryo implanted in a pregnant woman will feed directly on the baby and/or placental fluids, and the chestburster will erupt from the stomach of the woman. A Predalien (with the secondary mouth down its throat) will implant several eggs in a pregnant woman. (Avp:R)
Bursters have a touch of cuteness, in a way. Maybe it's its snout or its little squeals.
They often raise themselves to a foot high and are 36 inches long.
