Continuity mistake: Any shot of the alien which isn't made using a guy in a suit has a green glow around the alien's body but any guy-in-a-suit shots do NOT have a green glow.

Alien 3 (1992)
Plot summary
Directed by: David Fincher
Starring: Charles Dance, Charles S. Dutton, Paul McGann, Sigourney Weaver
The movie starts right at the end of the second film where Ellen Ripley and survivors start to travel back home. But unfortunately they crash land on some prison planet and Ripley discovers that her companions are already dead because of the Alien. Now the nightmare starts again as the Alien is beginning to kill some of the inhabitants of the prison.
Murphy: What kind of animal would do this to a dog?
Trivia: The film had a notoriously troubled production, with several writers and directors dropping out of the project during development. With a looming release date, sets were built and a crew was assembled before a script was even settled on, and the final draft had to be written around the sets that had already been built. David Fincher, then a popular music video and commercial director, was chosen to helm the film, but he had nonstop creative difficulties with the producers and studios. He has since gone on to disown the film, as he feels it isn't reflective of his vision.
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Answer: She means that the alien it moves on 4 legs, whereas the other aliens moved primarily on two legs. This alien came out of a dog in the theatrical version and from an ox in the Assembly cut version, which can only move on 4 legs. This hints to the fact that the alien inherits the characteristics of its host.
XIII