There are divided into four groups bacterial feeders, Fungal feeders, predatory nematodes, and omnivores. Bacterial feeders can consume bacteria which are the helpful nematodes, Fungal feeders feed by making a hole in the cell wall of fungi and feed on its insides, Predatory nematodes eat all types of nematodes. They will eat smaller organisms whole or attach themselves to larger organisms and slowly eat them away and Omnivores eat a variety of organisms and may have a different diet at different stages of life (Ingham Soil