In late September, filming moved to Hawaii for exterior shots for the film's Peruvian opening. The Paramount logo dissolving into a natural mountain was an improvisation by Spielberg based on his own childhood habit of doing the same while making films; the mountain is Kalalea Mountain on the island of Kauaʻi. Though the scene appears to be a single location, it was shot across 10 different areas in Hawaii, including the Huleia National Wildlife Refuge. It was originally more elaborate and longer, featuring an added betrayal by one of Jones' guides, resulting in a fight, and it had more dialogue; this was deemed unnecessary and removed for a tighter paced sequence. The cave's exterior was deemed a perfect location, though a nearby pool was a mosquito breeding ground; even with anti-mosquito equipment the crew was bitten. The donkeys used for the trek eventually suffered lameness. It was difficult to find replacements, and eventually, a pair of grey donkeys were painted brown with hair spray and flown by helicopter to the Nā Pali Coast State Park to finish the scene.