Spider monkeys eat quite a bit of fruit, as well as raw vegetables, green leaves, and primate biscuits. We usually give them a mixed bowl of bite-sized foods. Primates, guinea pigs, some birds, fruit bats, and many reptiles and amphibians need vitamin C in their diets, as they can't manufacture it themselves. In nature, capuchins are rather omnivorous, and eat insects, small vertebrates, bird eggs, and plant material. Sunlight or vitamin D-3 in the diet is also essential.
Monkeys are primates, just like humans.
Gorillas eat only plants in the wild, with lots of fiber and very little fat. We're just developing high-fiber biscuits they enjoy, and we've seen improved health with lower cholesterol problems. Our gorillas eat big green salads every day, with raw vegetables, very little fruit, high fiber biscuits, fresh browse from the trees, and no meat or eggs. Youngsters also get yogurt. The fruits they consume often have much more fiber and less water and sugar than fruit substitutes found in zoos.