Dinocephalians included herbivorous, carnivorous, and omnivorous forms. They include carnivorous, herbivorous, and omnivorous forms. Grasses are also eaten by omnivorous or even occasionally by primarily carnivorous animals. Their diets are similarly variable, with herbivorous, omnivorous, and insectivorous species all being known. They have highly specialized rasping mouth parts suitable for herbivorous, omnivorous or planktivorous diets. The common chimpanzee eats an omnivorous frugivorous diet. Oviraptoridae is a group of bird-like, herbivorous and omnivorous maniraptoran dinosaurs. Omnivorous, and more frugivorous than other foxes. Earwigs are mostly scavengers, but some are omnivorous or predatory. These nematodes are in turn consumed by omnivorous predatory nematodes. This genus is omnivorous and prone to scavenging. Piranhas belong to the subfamily Serrasalminae, which includes closely related omnivorous fish such as pacus. In the greenhouse, green manure increased omnivorous and predatory populations. Its dentition is well suited to an omnivorous diet. Most docodonts had teeth specialized for an omnivorous diet.