Every year, this city goes ape over the Denver Gorilla Run. The annual event raises money for the Mountain Gorilla Conservation Fund by pairing humans with gorilla costumes and setting them free on foot. Photographer Brandon Marshall was along for the fun on Saturday, and brought back these photos of the best-dressed primates.

See also: - Slide show: Gorilla Run 2012 - Best Costumes of 2012 (so far) - Haunted Hotel Party 2012

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For more photos, visit our full slide show.