War for the Planet of the Apes landed in theaters on Friday, and now a clip has emerged exploring the technology behind the blockbuster.

Actor Steve Zahn, who plays a chimpanzee called Bad Ape, explains the physical demands of the simian role. To capture their movements, actors wore tight unitards covered in reflective Velcro balls and dotted markers on their faces. After getting up to all kinds of monkey business, state-of-the-art software and editing equipment would then bring the primates to life in post-production.

Check out the fascinating clip above, and then watch movie protagonist Andy Serkis roast Donald Trump below.

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