The making of Alien's chestburster scene

Hello, Stumbled upon [url=http://www.guardian.co.uk/film/2009/oct/13/making-of-alien-chestburster?intcmp=239]this[/url] and [url=http://thegrio.com/2012/06/11/prometheus-fun-fact-original-alien-played-by-nigerian-student/#s:bolaji-16x9]this[/url] on my surf through internet (: What do you think? About the second link I never knew who portrayed the original Alien :D