zergnet.com This Engineer seems to be of a smaller giant classification.
http://screenrant.com/prometheus-deleted-scenes-blu-ray ,
http://avp.wikia.com/wiki/Hammerpede
The reptilian, shit-snake is quite vicious, but it was designed to be that way.
While the shit-snake likes to nest in the intestines, the snake can cause the whole body to mutate into a, monster. Fortunately, the movie Prometheus isn't just about snakes that want to nest within the Human_gastrointestinal_tract. Prometheus isn't suppose to be a scatological reptilian horror movie, but these snakes do like to feed & nest in any ones guts. Lets hope that such snakes are never created in a lab somewhere, because no one would want to become a food-nest for genetically engineered monsters.
Scotty Roberts has now been on coasttocoastam.com a few times & has an interesting take on this phenomenon. http://intrepidmag.com/scott-roberts-reveals-the-secret-history-of-the-reptilians
Here is another perspective. http://www.youtube.com/watch?v=EVADV4NxdHA,
http://www.acashic.com/extraterrestrial-interference
An interesting documentary: An Alien History of Planet Earth
http://www.youtube.com/watch?v=Ow3JtqjMExk
Alien_Planet Documentary
http://www.youtube.com/watch?v=BNLfNe12BKE
http://www.space.com/20230-giant-planet-atmosphere-solar-system.html
The first movie of the Alien_films had a very large shape in a chair. This GIANT seems to be much larger than this giant in the Prometheus movie.
http://www.slashfilm.com/damon-lindelof-explains-ridley-scotts-prometheus-connected-alien-films ,
http://www.firstshowing.net/2012/prometheus-credits-tag-leads-to-a-new-viral-site-weyland-video/?utm_source=zergnet.com&utm_medium=referral&utm_campaign=zergnet_24383
While the facehugger seemed to be more crab like, the other creature is certainly more like a snake at this phase.
http://www.avpgalaxy.net/alien-movies/prometheus/creatures , http://monstersandbeasts.blogspot.ca/2012/06/flat-worm-thing-prometheus.html
http://screencrush.com/prometheus-blade-runner/?utm_source=zergnet.com&utm_medium=referral&utm_campaign=zergnet_32813