A large number of monkeys living on Earth are omnivores. Their diet includes insects, crustaceans, seeds and fruits, berries, fruits, bird eggs, tree leaves, young shoots, and sometimes grass.
The largest monkeys in the world are gorillas. But, despite their huge size, gorillas are peaceful creatures that feed exclusively on plant foods. Feeding for gorillas occurs mainly on the ground, since their dimensions do not allow these monkeys to wander through the fragile branches of trees in search of food. These great apes eat a lot, and their massive jaws can grind even the hardest food - wood, tree bark, roots and stems of plants. These monkeys while away the lion's share of the time eating tree ferns and vines. Mountain gorillas eat bamboo shoots and wild celery.
Other great apes are the orangutans. It is one of two Asiatic genera of great apes (the second genus is gibbons). If we compare the orangutan with its African counterpart, the gorilla, the first monkey's external features are much more pronounced. Orangutans enjoy bananas, mangoes, plums, figs and other tropical fruits with great pleasure. Incredible strength and amazing agility allows these monkeys to conquer even the tallest trees in search of food, since the fruits on them are much tastier.
Monkeys are also omnivores, but they prefer fruits. They feed on everything they can find in the rainforest. Their diet includes seeds, roots, resin, insects, molluscs, fish, crustaceans, small reptiles (lizards), birds, small mammals (rodents). In other words, monkeys eat anything that is not poisonous, or anything that they can collect or catch.
Japanese short-tailed macaques feed exclusively on tree bark, while Javanese long-tailed macaques enjoy seafood, especially juicy crab meat. By the way, this monkey is sometimes called crab-eating macaque. The closest relative of humans, chimpanzees, feeds on fruits, nuts, young and juicy leaves, and sometimes fresh meat.
In general, the diet of monkeys is based mainly on ripe and sugary fruits, easily digestible plant parts, succulent shoots, palm hearts, flower buds, insects, nuts, and sometimes meat food. The fact is that the stomach of some primates is not adapted for enzymatic digestion. That is why the constant consumption of food rich in plant fiber (leaves, grass) can cause poisoning in some monkeys. But there are also primates who have this complete order, for example, colobuses have "pockets" in their stomachs with bacteria that secrete the corresponding enzymes.