Leaves and flowers: In addition to fruits, noisy night monkeys also feed on leaves and flowers. They are opportunistic feeders and will adjust their diet based on availability.
Insects: Noisy night monkeys supplement their diet with insects, such as beetles and grasshoppers. These insects provide them with protein and other essential nutrients.
Small vertebrates: On rare occasions, noisy night monkeys may prey on small vertebrates, such as frogs and lizards. These animals are usually taken advantage of when they are sick, injured, or sleeping.