Some are omnivorous, feeding to some extent on plant tissue such as wheat grains and vegetables. Several other families of beetles are entirely or partly comprised of species which are predatory. In addition to these, the following groups of terrestrial beetles may occasionally help reduce populations of plant pests, but there have been few attempts to use these in biological control. Flat bark beetles-Family Cucujidae. Most species are predaceous on mites and soft bodied insects found under bark of dead or dying trees or under debris on the ground.
Some species are destructive to stored products.
A few species are parasitic on larvae of wood inhabiting insects, such as the larvae of longhorned beetles. Click beetles-Family Elateridae. Wireworms, the larvae of click beetles, live in soils, decaying vegetation, under bark and other situations where they are not exposed to light. There are many destructive species, and many others are scavengers. However, many species are predaceous, feeding on insects and other invertebrates.