Computers helped the filmmakers present their vision in new ways. For the "wildebeest stampede" sequence, several distinct wildebeest characters were created in a 3D computer program, multiplied into hundreds, cel shaded to look like drawn animation, and given randomized paths down a mountainside to simulate the real, unpredictable movement of a herd. Five specially trained animators and technicians spent more than two years creating the two-and-a-half-minute stampede. The Computer Animation Production System (CAPS) helped simulate camera movements such as tracking shots, and was employed in coloring, lighting, and particle effects.