The crew tried to keep CGI use to a minimum, as Anderson said people in suits and puppets are scarier than CGI monsters as they are "there in the frame". Roughly 70% of scenes were created using suits, puppets, and miniatures, with both real elements and CGI often used within the same shot (depending on what looked best). The Alien queen was filmed using three variations: a 4.8-meter practical version, a 1.2-meter puppet, and a computer-generated version. The practical version required 12 puppeteers to operate. CGI tails were added to the Aliens and the Queen as they were difficult to animate using puppetry. Anderson praised Alien director Ridley Scott's and Predator director John McTiernan's abilities at building suspense by not showing the creatures until late in the film, something Anderson wanted to accomplish with Alien vs. Predator. He later commented, "Yes, we make you wait 45 minutes, but once it goes off, from there until the end of the movie, it's fucking relentless".

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