Interesting view into the biology of the creatures in 'Prometheus'

Very interesting biological details from the 'Prometheus' Alien Playground Interview'..... "The film’s new creatures are the work of Creative Supervisor for Creature Effects and Special Make-Up Effects Neal Scanlan and Prosthetic Supervisor Conor O’Sullivan. “We present the evolution of these nasty bits and pieces of creature evolution in a logical and biological fashion,” says Scott. Adds Scanlan: “Each stage of a creature’s life cycle has a distinctive purpose. For our xenobiology, we brought in new elements that are not necessarily backward from those in Alien, but are of a similar DNA. Many of Ridley’s references are derived from nature – plants, vegetables, sea creatures and other animals. Nothing is invented.”